Principal Diagnosis Categories
Principal Diagnosis subcategories with 50 observations or less are grouped into their Principal Diagnosis Category Title (X.99) categories with the exception of those under Principal Diagnosis Categories found in Residual codes, unclassified, and all E codes which have no explicit subcategory.

1	Infectious and parasitic diseases
1.01	Tuberculosis
1.02	Septicemia
1.03	Bacterial infections
1.04	Fungal infections
1.05	Foodborne intoxications
1.06	HIV infection
1.07	Hepatitis
1.08	Viral infection
1.09	Parasitic, other specified and unspecified infections
1.10	Sexually transmitted infections (excluding HIV and hepatitis)
1.11	Sequela of specified infectious disease conditions
1.12	COVID-19
1.99	Other infections and parasitic diseases

2	Neoplasms
2.01	Head and neck cancers - eye
2.02	Head and neck cancers - lip and oral cavity
2.03	Head and neck cancers - throat
2.04	Head and neck cancers - salivary gland
2.05	Head and neck cancers - nasopharyngeal
2.06	Head and neck cancers - hypopharyngeal
2.07	Head and neck cancers - pharyngeal
2.08	Head and neck cancers - laryngeal
2.09	Head and neck cancers - tonsils
2.10	Head and neck cancers - all other types
2.11	Cardiac cancers
2.12	Gastrointestinal cancers - esophagus
2.13	Gastrointestinal cancers - stomach
2.14	Gastrointestinal cancers - small intestine
2.15	Gastrointestinal cancers - colorectal
2.16	Gastrointestinal cancers - anus
2.17	Gastrointestinal cancers - liver
2.18	Gastrointestinal cancers - bile duct
2.19	Gastrointestinal cancers - gallbladder
2.20	Gastrointestinal cancers - peritoneum
2.21	Gastrointestinal cancers - all other types
2.22	Respiratory cancers
2.23	Bone cancer
2.24	Sarcoma
2.25	Skin cancers - melanoma
2.26	Skin cancers - basal cell carcinoma
2.27	Skin cancers - squamous cell carcinoma
2.28	Skin cancers - all other types
2.29	Breast cancer - ductal carcinoma in situ (DCIS)
2.30	Breast cancer - all other types
2.31	Female reproductive system cancers - uterus
2.32	Female reproductive system cancers - cervix
2.33	Female reproductive system cancers - ovary
2.34	Female reproductive system cancers - fallopian tube
2.35	Female reproductive system cancers - endometrium
2.36	Female reproductive system cancers - vulva
2.37	Female reproductive system cancers - vagina
2.38	Female reproductive system cancers - all other types
2.39	Male reproductive system cancers - prostate
2.40	Male reproductive system cancers - testis
2.41	Male reproductive system cancers - penis
2.42	Male reproductive system cancers - all other types
2.43	Urinary system cancers - bladder
2.44	Urinary system cancers - ureter and renal pelvis
2.45	Urinary system cancers - kidney
2.46	Urinary system cancers - urethra
2.47	Urinary system cancers - all other types
2.48	Nervous system cancers - brain
2.49	Nervous system cancers - all other types
2.50	Endocrine system cancers - thyroid
2.51	Endocrine system cancers - pancreas
2.52	Endocrine system cancers - thymus
2.53	Endocrine system cancers - adrenocortical
2.54	Endocrine system cancers - parathyroid
2.55	Endocrine system cancers - pituitary gland
2.56	Endocrine system cancers - all other types
2.57	Hodgkin lymphoma
2.58	Non-Hodgkin lymphoma
2.59	Leukemia - acute lymphoblastic leukemia (ALL)
2.60	Leukemia - acute myeloid leukemia (AML)
2.61	Leukemia - chronic lymphocytic leukemia (CLL)
2.62	Leukemia - chronic myeloid leukemia (CML)
2.63	Leukemia - hairy cell
2.64	Leukemia - all other types
2.65	Multiple myeloma
2.66	Malignant neuroendocrine tumors
2.67	Mesothelioma
2.68	Myelodysplastic syndrome (MDS)
2.69	Cancer of other sites
2.70	Secondary malignancies
2.71	Malignant neoplasm, unspecified
2.72	Neoplasms of unspecified nature or uncertain behavior
2.73	Benign neoplasms
2.74	Conditions due to neoplasm or the treatment of neoplasm
2.99	Other neoplasms

3	Endocrine, nutritional, and metabolic diseases and immunity disorders
3.01	Thyroid disorders
3.02	Diabetes mellitus without complication
3.03	Diabetes mellitus with complication
3.04	Diabetes mellitus, Type 1
3.05	Diabetes mellitus, Type 2
3.06	Diabetes mellitus, due to underlying condition, drug or chemical induced, or other specified type
3.07	Nutritional deficiencies
3.08	Malnutrition
3.09	Obesity
3.10	Disorders of lipid metabolism
3.11	Fluid and electrolyte disorders
3.12	Cystic fibrosis
3.13	Pituitary disorders
3.14	Postprocedural or postoperative endocrine or metabolic complication
3.15	Other specified and unspecified endocrine disorders
3.16	Other specified and unspecified nutritional and metabolic disorders
3.17	Sequela of malnutrition and other nutritional deficiencies
3.99	Other endocrine, nutritional, metabolic diseases and immunity disorders

4	Diseases of blood and blood-forming organs
4.01	Nutritional anemia
4.02	Hemolytic anemia
4.03	Aplastic anemia
4.04	Acute posthemorrhagic anemia
4.05	Sickle cell trait/anemia
4.06	Coagulation and hemorrhagic disorders
4.07	Diseases of white blood cells
4.08	Immunity disorders
4.09	Postprocedural or postoperative complications of the spleen
4.10	Other specified and unspecified hematologic conditions
4.99	Other diseases of blood and blood-forming organs

5	Mental illness
5.01	Schizophrenia spectrum and other psychotic disorders
5.02	Depressive disorders
5.03	Bipolar and related disorders
5.04	Other specified and unspecified mood disorders
5.05	Anxiety and fear-related disorders
5.06	Obsessive-compulsive and related disorders
5.07	Trauma- and stressor-related disorders
5.08	Disruptive, impulse-control and conduct disorders
5.09	Personality disorders
5.10	Feeding and eating disorders
5.11	Somatic disorders
5.12	Suicidal ideation/attempt/intentional self-harm
5.13	Miscellaneous mental and behavioral disorders/conditions
5.14	Neurodevelopmental disorders
5.17	Alcohol-related disorders
5.18	Opioid-related disorders
5.19	Cannabis-related disorders
5.20	Sedative-related disorders
5.21	Stimulant-related disorders
5.22	Hallucinogen-related disorders
5.23	Inhalant-related disorders
5.24	Tobacco-related disorders
5.25	Other specified substance-related disorders
5.26	Mental and substance use disorders in remission
5.27	Suicide attempt/intentional self-harm; subsequent encounter
5.28	Opioid-related disorders; subsequent encounter
5.29	Stimulant-related disorders; subsequent encounter
5.30	Cannabis-related disorders; subsequent encounter
5.31	Hallucinogen-related disorders; subsequent encounter
5.32	Sedative-related disorders; subsequent encounter
5.33	Inhalant-related disorders; subsequent encounter
5.34	Mental and substance use disorders; sequela
5.99	Other mental illnesses

6	Diseases of nervous system and sense organs
6.01	Meningitis
6.02	Encephalitis
6.03	Other specified CNS infection and poliomyelitis
6.04	Parkinson`s disease
6.05	Multiple sclerosis
6.06	Other specified hereditary and degenerative nervous system conditions
6.07	Cerebral palsy
6.08	Paralysis (other than cerebral palsy)
6.09	Epilepsy; convulsions
6.10	Headache; including migraine
6.11	Neurocognitive disorders
6.12	Transient cerebral ischemia
6.13	Coma; stupor; and brain damage
6.14	CNS abscess
6.15	Polyneuropathies
6.16	Sleep wake disorders
6.17	Nerve and nerve root disorders
6.18	Myopathies
6.19	Nervous system pain and pain syndromes
6.20	Other specified nervous system disorders
6.21	Postprocedural or postoperative nervous system complication
6.22	Sequela of specified nervous system conditions
6.99	Other diseases of the nervous system and sense organs

7	Diseases of circulatory system
7.01	Chronic rheumatic heart disease
7.02	Acute rheumatic heart disease
7.03	Nonrheumatic and unspecified valve disorders
7.04	Endocarditis and endocardial disease
7.05	Myocarditis and cardiomyopathy
7.06	Pericarditis and pericardial disease
7.07	Essential hypertension
7.08	Hypertension with complications and secondary hypertension
7.09	Acute myocardial infarction
7.10	Complications of acute myocardial infarction
7.11	Coronary atherosclerosis and other heart disease
7.12	Nonspecific chest pain
7.13	Acute pulmonary embolism
7.14	Pulmonary heart disease
7.15	Other and ill-defined heart disease
7.16	Conduction disorders
7.17	Cardiac dysrhythmias
7.18	Cardiac arrest and ventricular fibrillation
7.19	Heart failure
7.20	Cerebral infarction
7.21	Acute hemorrhagic cerebrovascular disease
7.22	Sequela of hemorrhagic cerebrovascular disease
7.23	Occlusion or stenosis of precerebral or cerebral arteries without infarction
7.24	Other and ill-defined cerebrovascular disease
7.25	Sequela of cerebral infarction and other cerebrovascular disease
7.26	Peripheral and visceral vascular disease
7.27	Arterial dissections
7.28	Gangrene
7.29	Aortic; peripheral; and visceral artery aneurysms
7.30	Aortic and peripheral arterial embolism or thrombosis
7.31	Hypotension
7.32	Other specified and unspecified circulatory disease
7.33	Acute phlebitis; thrombophlebitis and thromboembolism
7.34	Chronic phlebitis; thrombophlebitis and thromboembolism
7.35	Varicose veins of lower extremity
7.36	Postthrombotic syndrome and venous insufficiency/hypertension
7.37	Vasculitis
7.38	Postprocedural or postoperative circulatory system complication
7.39	Other specified diseases of veins and lymphatics
7.99	Other diseases of thecirculatory system

8	Diseases of the respiratory system
8.01	Sinusitis
8.02	Pneumonia (except that caused by tuberculosis)
8.03	Influenza
8.04	Acute and chronic tonsillitis
8.05	Acute bronchitis
8.06	Other specified upper respiratory infections
8.07	Other specified and unspecified upper respiratory disease
8.08	Chronic obstructive pulmonary disease and bronchiectasis
8.09	Asthma
8.10	Aspiration pneumonitis
8.11	Pleurisy, pleural effusion and pulmonary collapse
8.12	Respiratory failure; insufficiency; arrest
8.13	Lung disease due to external agents
8.14	Pneumothorax
8.15	Mediastinal disorders
8.16	Other specified and unspecified lower respiratory disease
8.17	Postprocedural or postoperative respiratory system complication
8.99	Other diseases of the repiratory system

9	Diseases of digestive system
9.01	Intestinal infection
9.02	Disorders of teeth and gingiva
9.03	Diseases of mouth; excluding dental
9.04	Esophageal disorders
9.05	Gastroduodenal ulcer
9.06	Gastrointestinal and biliary perforation
9.07	Gastritis and duodenitis
9.08	Other specified and unspecified disorders of stomach and duodenum
9.09	Appendicitis and other appendiceal conditions
9.10	Abdominal hernia
9.11	Regional enteritis and ulcerative colitis
9.12	Intestinal obstruction and ileus
9.13	Diverticulosis and diverticulitis
9.14	Hemorrhoids
9.15	Anal and rectal conditions
9.16	Peritonitis and intra-abdominal abscess
9.17	Biliary tract disease
9.18	Hepatic failure
9.19	Other specified and unspecified liver disease
9.20	Pancreatic disorders (excluding diabetes)
9.21	Gastrointestinal hemorrhage
9.22	Noninfectious gastroenteritis
9.23	Noninfectious hepatitis
9.24	Postprocedural or postoperative digestive system complication
9.25	Other specified and unspecified gastrointestinal disorders
9.99	Other diseases of the digestive system

10	Diseases of genitourinary system
10.01	Nephritis; nephrosis; renal sclerosis
10.02	Acute and unspecified renal failure
10.03	Chronic kidney disease
10.04	Urinary tract infections
10.05	Calculus of urinary tract
10.06	Other specified and unspecified diseases of kidney and ureters
10.07	Other specified and unspecified diseases of bladder and urethra
10.08	Urinary incontinence
10.09	Hematuria
10.10	Proteinuria
10.11	Vesicoureteral reflux
10.12	Hyperplasia of prostate
10.13	Inflammatory conditions of male genital organs
10.14	Erectile dysfunction
10.15	Male infertility
10.16	Other specified male genital disorders
10.17	Nonmalignant breast conditions
10.18	Inflammatory diseases of female pelvic organs
10.19	Endometriosis
10.20	Prolapse of female genital organs
10.21	Menstrual disorders
10.22	Benign ovarian cyst
10.23	Menopausal disorders
10.24	Female infertility
10.25	Other specified female genital disorders
10.26	Postprocedural or postoperative genitourinary system complication
10.99	Other diseases of the genitourinary system

11	Complications of pregnancy, childbirth, and puerperium
11.01	Antenatal screening
11.02	Gestational weeks
11.03	Spontaneous abortion and complications of spontaneous abortion
11.04	Induced abortion and complications of termination of pregnancy
11.05	Ectopic pregnancy and complications of ectopic pregnancy
11.06	Molar pregnancy and other abnormal products of conception
11.07	Complications following ectopic and/or molar pregnancy
11.08	Supervision of high-risk pregnancy
11.09	Early, first or unspecified trimester hemorrhage
11.10	Hemorrhage after first trimester
11.11	Early or threatened labor
11.12	Multiple gestation
11.13	Maternal care related to fetal conditions
11.14	Polyhydramnios and other problems of amniotic cavity
11.15	Obstetric history affecting care in pregnancy
11.16	Previous C-section
11.17	Maternal care for abnormality of pelvic organs
11.18	Maternal care related to disorders of the placenta and placental implantation
11.19	Diabetes or abnormal glucose tolerance complicating pregnancy; childbirth; or the puerperium
11.20	Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium
11.21	Maternal intrauterine infection
11.22	Prolonged pregnancy
11.23	Complications specified during childbirth
11.24	Malposition, disproportion or other labor complications
11.25	Anesthesia complications during pregnancy
11.26	OB-related trauma to perineum and vulva
11.27	Complications specified during the puerperium
11.28	Other specified complications in pregnancy
11.29	Uncomplicated pregnancy, delivery or puerperium
11.30	Maternal outcome of delivery
11.99	Other complications of pregnancy, childbirth, and puerperium

12	Diseases of skin and subcutaneous tissue
12.01	Skin and subcutaneous tissue infections
12.02	Other specified inflammatory condition of skin
12.03	Pressure ulcer of skin
12.04	Non-pressure ulcer of skin
12.05	Contact dermatitis
12.06	Postprocedural or postoperative skin complication
12.07	Other specified and unspecified skin disorders
12.99	Other diseases of the skin and subcutaneous tissue

13	Diseases of musculoskeletal system and connective tissue
13.01	Infective arthritis
13.02	Osteomyelitis
13.03	Rheumatoid arthritis and related disease
13.04	Juvenile arthritis
13.05	Other specified chronic arthropathy
13.06	Osteoarthritis
13.07	Other specified joint disorders
13.08	Immune-mediated/reactive arthropathies
13.09	Tendon and synovial disorders
13.10	Musculoskeletal pain, not low back pain
13.11	Spondylopathies/spondyloarthropathy (including infective)
13.12	Biomechanical lesions
13.13	Osteoporosis
13.14	Pathological fracture, initial encounter
13.15	Pathological fracture, subsequent encounter
13.16	Stress fracture, initial encounter
13.17	Stress fracture, subsequent encounter
13.18	Atypical fracture, initial encounter
13.19	Atypical fracture, subsequent encounter
13.20	Pathological, stress and atypical fractures, sequela
13.21	Acquired foot deformities
13.22	Scoliosis and other postural dorsopathic deformities
13.23	Acquired deformities (excluding foot)
13.24	Systemic lupus erythematosus and connective tissue disorders
13.25	Other specified connective tissue disease
13.26	Muscle disorders
13.27	Musculoskeletal abscess
13.28	Other specified bone disease and musculoskeletal deformities
13.29	Disorders of jaw
13.30	Aseptic necrosis and osteonecrosis
13.31	Traumatic arthropathy
13.32	Neurogenic/neuropathic arthropathy
13.33	Gout
13.34	Crystal arthropathies (excluding gout)
13.35	Osteomalacia
13.36	Autoinflammatory syndromes
13.37	Postprocedural or postoperative musculoskeletal system complication
13.38	Low back pain
13.99	Other diseases of the musculoskeletal system and connective tissue

14	Congenital anomalies
14.01	Cardiac and circulatory congenital anomalies
14.02	Digestive congenital anomalies
14.03	Genitourinary congenital anomalies
14.04	Nervous system congenital anomalies
14.05	Congenital malformations of eye, ear, face, neck
14.06	Cleft lip or palate
14.07	Respiratory congenital malformations
14.08	Musculoskeletal congenital conditions
14.09	Chromosomal abnormalities
14.10	Other specified and unspecified congenital anomalies
14.99	Other congenital anomalies

15	Certain conditions originating in perinatal period
15.01	Liveborn
15.02	Short gestation; low birth weight; and fetal growth retardation
15.03	Neonatal acidemia and hypoxia
15.04	Neonatal cerebral disorders
15.05	Respiratory distress syndrome
15.06	Respiratory perinatal condition
15.07	Hemolytic jaundice and perinatal jaundice
15.08	Birth trauma
15.09	Perinatal infections
15.10	Newborn affected by maternal conditions or complications of labor/delivery
15.11	Hemorrhagic and hematologic disorders of newborn
15.12	Neonatal digestive and feeding disorders
15.13	Other specified and unspecified perinatal conditions
15.14	Neonatal abstinence syndrome
15.15	Fetal alcohol syndrome
15.99	Other certain conditions originating in the perinatal period

16	Injury and poisoning
16.01	Fracture of head and neck, initial encounter
16.02	Fracture of the spine and back, initial encounter
16.03	Fracture of torso, initial encounter
16.04	Fracture of the upper limb, initial encounter
16.05	Fracture of the lower limb (except hip), initial encounter
16.06	Fracture of the neck of the femur (hip), initial encounter
16.07	Dislocations, initial encounter
16.08	Traumatic brain injury (TBI); concussion, initial encounter
16.09	Spinal cord injury (SCI), initial encounter
16.10	Internal organ injury, initial encounter
16.11	Open wounds of head and neck, initial encounter
16.12	Open wounds to limbs, initial encounter
16.13	Open wounds of trunk, initial encounter
16.14	Amputation of a limb, initial encounter
16.15	Amputation of other body parts, initial encounter
16.16	Injury to blood vessels, initial encounter
16.17	Superficial injury; contusion, initial encounter
16.18	Crushing injury, initial encounter
16.19	Burn and corrosion, initial encounter
16.20	Effect of foreign body entering opening, initial encounter
16.21	Effect of other external causes, initial encounter
16.22	Poisoning by drugs, initial encounter
16.23	Toxic effects, initial encounter
16.24	Sprains and strains, initial encounter
16.25	Injury to nerves, muscles and tendons, initial encounter
16.26	Other specified injury
16.27	Other unspecified injury
16.28	Adverse effects of drugs and medicaments, initial encounter
16.29	Underdosing of drugs and medicaments, initial encounter
16.30	Drug induced or toxic related condition
16.31	Allergic reactions
16.32	Maltreatment/abuse
16.33	Complication of cardiovascular device, implant or graft, initial encounter
16.34	Complication of genitourinary device, implant or graft, initial encounter
16.35	Complication of internal orthopedic device or implant, initial encounter
16.36	Complication of transplanted organs or tissue, initial encounter
16.37	Complication of other surgical or medical care, injury, initial encounter
16.38	Fracture of head and neck, subsequent encounter
16.39	Fracture of the spine and back, subsequent encounter
16.40	Fracture of torso, subsequent encounter
16.41	Fracture of the upper limb, subsequent encounter
16.42	Fracture of lower limb (except hip), subsequent encounter
16.43	Fracture of the neck of the femur (hip), subsequent encounter
16.44	Dislocations, subsequent encounter
16.45	Traumatic brain injury (TBI); concussion, subsequent encounter
16.46	Spinal cord injury (SCI), subsequent encounter
16.47	Internal organ injury, subsequent encounter
16.48	Open wounds of head and neck, subsequent encounter
16.49	Open wounds to limbs, subsequent encounter
16.50	Open wounds of trunk, subsequent encounter
16.51	Amputation of a limb, subsequent encounter
16.52	Amputation of other body parts, subsequent encounter
16.53	Injury to blood vessels, subsequent encounter
16.54	Superficial injury; contusion, subsequent encounter
16.55	Crushing injury, subsequent encounter
16.56	Burns and corrosion, subsequent encounter
16.57	Effect of foreign body entering opening, subsequent encounter
16.58	Effect of other external causes, subsequent encounter
16.59	Poisoning by drugs, subsequent encounter
16.60	Toxic effects, subsequent encounter
16.61	Sprains and strains, subsequent encounter
16.62	Injury to nerves, muscles and tendons, subsequent encounter
16.63	Other specified injury, subsequent encounter
16.64	Other unspecified injuries, subsequent encounter
16.65	Adverse effects of drugs and medicaments, subsequent encounter
16.66	Underdosing of drugs and medicaments, subsequent encounter
16.67	Allergic reactions, subsequent encounter
16.68	Maltreatment/abuse, subsequent encounter
16.69	Complication of cardiovascular device, implant or graft, subsequent encounter
16.70	Complication of genitourinary device, implant or graft, subsequent encounter
16.71	Complication of internal orthopedic device or implant, subsequent encounter
16.72	Complication of other surgical or medical care, injury, subsequent encounter
16.73	Injury, sequela
16.74	Effect of other external causes, sequela
16.75	Poisoning/toxic effect/adverse effects/underdosing, sequela
16.76	Complication, sequela
16.99	Other injury and poisonings

17	Symptoms, signs, and ill-defined conditions and factors influencing health status
17.01	Syncope
17.02	Fever
17.03	Shock
17.04	Nausea and vomiting
17.05	Dysphagia
17.06	Abdominal pain and other digestive/abdomen signs and symptoms
17.07	Malaise and fatigue
17.08	Symptoms of mental and substance use conditions
17.09	Abnormal findings related to substance use
17.10	Nervous system signs and symptoms
17.11	Genitourinary signs and symptoms
17.12	Circulatory signs and symptoms
17.13	Respiratory signs and symptoms
17.14	Skin/Subcutaneous signs and symptoms
17.15	General sensation/perception signs and symptoms
17.16	Other general signs and symptoms
17.17	Abnormal findings without diagnosis
17.99	Other symptoms, signs, and ill-defined conditions and factors influencing health status

18	Diseases of the Ear and Mastoid Process
18.01	Otitis media
18.02	Diseases of middle ear and mastoid (except otitis media)
18.03	Diseases of inner ear and related conditions
18.04	Hearing loss
18.05	Postprocedural or postoperative ear and/or mastoid process complication
18.06	Other specified and unspecified disorders of the ear
18.99	Other diseases of the ear and mastoid process

19	Diseases of the Eye and Adnexa
19.01	Cornea and external disease
19.02	Cataract and other lens disorders
19.03	Glaucoma
19.04	Uveitis and ocular inflammation
19.05	Retinal and vitreous conditions
19.06	Neuro-ophthalmology
19.07	Strabismus
19.08	Oculofacial plastics and orbital conditions
19.09	Refractive error
19.10	Blindness and vision defects
19.11	Postprocedural or postoperative eye complication
19.12	Other specified eye disorders
19.99	Other diseases of the eye and adnexa

20	External Casues of Morbidity
20.01	External cause codes: cut/pierce; initial encounter
20.02	External cause codes: drowning/submersion; initial encounter
20.03	External cause codes: fall; initial encounter
20.04	External cause codes: fire/burn; initial encounter
20.05	External cause codes: firearm; initial encounter
20.06	External cause codes: machinery; initial encounter
20.07	External cause codes: motor vehicle traffic (MVT); initial encounter
20.08	External cause codes: pedal cyclist; not MVT; initial encounter
20.09	External cause codes: pedestrian; not MVT; initial encounter
20.10	External cause codes: transport; not MVT; initial encounter
20.11	External cause codes: natural/environment; initial encounter
20.12	External cause codes: bites; initial encounter
20.13	External cause codes: overexertion; initial encounter
20.14	External cause codes: poisoning by drug
20.15	External cause codes: poisoning by non-drug
20.16	External cause codes: struck by; against; initial encounter
20.17	External cause codes: suffocation/inhalation; initial encounter
20.18	External cause codes: other specified, classifiable and NEC; initial encounter
20.19	External cause codes: unspecified mechanism
20.20	External cause codes: intent of injury, accidental/unintentional
20.21	External cause codes: intent of injury, self-harm
20.22	External cause codes: intent of injury, assault
20.23	External cause codes: intent of injury, undetermined
20.24	External cause codes: intent of injury, legal intervention/war
20.25	External cause codes: complications of medical and surgical care, initial encounter
20.26	External cause codes: activity codes
20.27	External cause codes: place of occurrence of the external cause
20.28	External cause codes: evidence of alcohol involvement
20.29	External cause codes: subsequent encounter
20.30	External cause codes: sequela
20.99	Other external causes of morbidity

21	Factors Influencing Health Status and Contact with Health Services
21.01	Encounter for administrative purposes
21.02	Encounter for mental health services related to abuse
21.03	Encounter for observation and examination for conditions ruled out (excludes infectious disease, neoplasm, mental disorders)
21.04	Encounter for prophylactic or other procedures
21.05	Encounter for prophylactic measures (excludes immunization)
21.06	Encounter for antineoplastic therapies
21.07	Encounter for mental health conditions
21.08	Neoplasm-related encounters
21.09	Implant, device or graft related encounter
21.10	Other aftercare encounter
21.11	Counseling related to sexual behavior or orientation
21.12	Other specified encounters and counseling
21.13	Contraceptive and procreative management
21.14	Medical examination/evaluation
21.15	Resistance to antimicrobial drugs
21.16	Exposure, encounters, screening or contact with infectious disease
21.17	No immunization or underimmunization
21.18	Screening for neurocognitive or neurodevelopmental condition
21.19	Socioeconomic/psychosocial factors
21.20	Lifestyle/life management factors
21.21	Personal/family history of disease
21.22	Acquired absence of limb or organ
21.23	Organ transplant status
21.24	Carrier status
21.25	Other specified status
21.99	Other factors influencing health status and contact with health services

22	Residual codes, unclassified, all E codes and surpressed codes due to <=50 observations
22.99	Residual codes, unclassified, all E codes and surpressed codes due to <=50 observations

Procedures
Procedure subcategories with 50 observations or less are grouped into their other Procedure Title (X.99) categories with the exception of those under Procedures found in Residual codes, unclassified, and all E codes which have no explicit subcategory.

1	Administration of Therapeutic Substances
1.01	Transfusion of blood and blood products
1.02	Transfusion of plasma
1.03	Administration of albumin and globulin
1.04	Transfusion of clotting factors
1.05	Administration of thrombolytics and platelet inhibitors
1.06	Infusion of vasopressor
1.07	Intravenous induction of labor
1.08	Cervical ripening
1.09	Rh immunoglobulin and other serum infusion
1.10	Vaccinations
1.11	Administration and transfusion of bone marrow, stem cells, pancreatic islet cells, and t-cells
1.12	Chemotherapy
1.13	Peritoneal dialysis
1.14	Regional anesthesia
1.15	Administration of antibiotics
1.16	Administration of anti-inflammatory agents
1.17	Administration of nutritional and electrolytic substances
1.18	Irrigation (diagnostic and therapeutic)
1.19	Potential COVID-19 therapies
1.20	Administration of diagnostic substances, NEC
1.21	Administration of therapeutic substances, NEC
1.99	Other administration of therapeutic substances

2	Cardiovascular Procedures
2.01	Heart biopsy
2.02	Heart conduction mechanism procedures
2.03	Coronary artery bypass grafts (CABG)
2.04	Percutaneous coronary interventions (PCI)
2.05	Other coronary artery procedures (excluding CABG and PCI)
2.06	Carotid endarterectomy and stenting
2.07	Embolectomy, endarterectomy, and related vessel procedures (non-endovascular; excluding carotid)
2.08	Angioplasty and related vessel procedures (endovascular; excluding carotid)
2.09	Left atrial appendage procedures
2.10	Ligation and embolization of vessels
2.11	Aneurysm repair procedures
2.12	Vessel repair and replacement
2.13	Heart and great vessel bypass procedures
2.14	Peripheral arterial bypass procedures
2.15	Peripheral arteriovenous fistula and shunt procedures
2.16	Portal and other venous bypass procedures
2.17	Pericardial procedures
2.18	Heart transplant
2.19	Septal repair and other therapeutic heart procedures
2.20	Saphenous vein harvest and other therapeutic vessel removal
2.21	Artery, vein, and great vessel procedures, NEC
2.22	Heart valve replacement and other valve procedures (non-endovascular)
2.23	Heart valve replacement and other valve procedures (endovascular)
2.24	Venous and arterial catheter placement
2.25	Placement of tunneled or implantable portion of a vascular access device
2.26	Pacemaker and defibrillator procedures
2.27	Heart assist device procedures
2.28	Inferior vena cava (IVC) filter procedures
2.29	Cardiovascular device procedures, NEC
2.99	Other cardiovascular procedures

3	Chiropractic Treatment
3.01	Chiropractic manipulation
3.99	Other chiropractic treatments

4	Central Nervous System Procedures
4.01	Minimally invasive CNS biopsy
4.02	Lumbar puncture
4.03	Spinal canal and spinal cord drainage (excluding lumbar puncture)
4.04	Intracranial epidural and subdural space drainage
4.05	Ventriculostomy [percutaneous approach]
4.06	Other CNS drainage and related procedures
4.07	CNS excision procedures
4.08	Spinal cord decompression
4.09	Decompressive craniectomy
4.10	Cerebrospinal fluid shunt procedures
4.11	Meninges repair
4.12	CNS neurostimulator procedures
4.13	Spinal epidural catheter placement
4.14	CNS procedures, NEC
4.99	Other central nervous system procedures

5	Endocrine Procedures
5.01	Endocrine system biopsy
5.02	Thyroidectomy
5.03	Parathyroidectomy
5.04	Adrenalectomy
5.05	Pituitary gland resection
5.06	Endocrine procedures, NEC
5.99	Other endocrine procedures

6	Ear, Nose, and Throat Procedures
6.01	Laryngoscopy (diagnostic)
6.02	ENT diagnostic endoscopy (excluding laryngoscopy)
6.03	ENT diagnostic procedures (non-endoscopic)
6.04	Diagnostic audiology
6.05	Myringotomy
6.06	ENT drainage (excluding myringotomy)
6.07	Tonsillectomy and adenoidectomy
6.08	Nasal and sinus excision
6.09	Tongue excision
6.10	Salivary gland excision
6.11	Laryngectomy
6.12	ENT excision (excluding nasal passage, sinuses, tongue, salivary glands, larynx)
6.13	ENT repair
6.14	Frenectomy
6.15	Dental procedures
6.16	Face transplant
6.17	ENT procedures, NEC
6.99	Other ear, nose, and throat procedures

7	Extracorporeal or Systemic Assistance and Performance
7.01	Hemodialysis
7.02	Extracorporeal membrane oxygenation
7.03	Mechanical ventilation
7.04	Non-invasive ventilation
7.05	Cardiac chest compression
7.06	Cardioversion
7.07	Cardiac pacing
7.08	Open heart cardiopulmonary bypass
7.09	Cardiac assistance with balloon pump
7.10	Cardiac assistance with ventricular assist device
7.11	Hyperbaric oxygen therapy
7.99	Other extracorporeal or systemic assistance and performance

8	Extracorporeal or Systemic Therapies
8.01	Pheresis therapy
8.02	Phototherapy
8.03	Ultraviolet light therapy
8.04	Hypothermia therapy
8.05	Extracorporeal or systemic therapies, NEC
8.99	Other extracorporeal or systemic therapies

9	Eye Procedures
9.01	Eye procedures
9.02	Eyelid procedures
9.99	Other eye procedures

10	Female Reproductive System Procedures
10.01	Hysterectomy
10.02	Oophorectomy
10.03	Salpingectomy
10.04	Trachelectomy
10.05	Fallopian tube ligation and excision
10.06	Vulvar laceration repair
10.07	Female genital tract repair (excluding vulva)
10.08	Cervical dilation
10.09	Cervical cerclage
10.10	Female upper genital tract excision
10.11	Female lower genital tract excision
10.12	Intrauterine device (IUD) insertion
10.13	Subcutaneous contraceptive implant
10.14	Ovary or uterus transplant
10.15	Female reproductive system procedures, NEC
10.99	Other female reproductive system procedures

11	Gastrointestinal System Procedures
11.01	Esophagogastroduodenoscopy (EGD) with biopsy
11.02	Colonoscopy and proctoscopy with biopsy
11.03	GI system biopsy (non-endoscopic)
11.04	GI system endoscopy without biopsy (diagnostic)
11.05	Exploration of peritoneal cavity
11.06	Paracentesis
11.07	GI system drainage (excluding paracentesis)
11.08	Appendectomy
11.09	Colectomy
11.10	Gastrectomy
11.11	Small bowel resection
11.12	Duodenal resection
11.13	Proctectomy or anal resection
11.14	Esophagectomy
11.15	Omentectomy or peritoneum resection
11.16	GI system endoscopic therapeutic procedures
11.17	Gastrostomy
11.18	Ileostomy and colostomy
11.19	Gastro-jejunal bypass (including bariatric)
11.20	Anorectal repair (3rd and 4th degree obstetrical repairs and other)
11.21	GI system repair (excluding anorectal)
11.22	GI system lysis of adhesions
11.23	GI transplant
11.24	Other peritoneal cavity procedures
11.25	Other GI system device procedures
11.26	Upper GI therapeutic procedures, NEC (open and laparoscopic)
11.27	Upper GI therapeutic procedures, NEC (endoscopic)
11.28	Lower GI therapeutic procedures, NEC (open and laparoscopic)
11.29	Lower GI therapeutic procedures, NEC (excluding open and laparoscopic)
11.99	Other gastrointestinal system procedures

12	General Region Procedures
12.01	Cosmetic procedures
12.02	Abdominal wall repair (including hernia)
12.03	Inguinal and femoral hernia repair
12.04	Endoscopic control of bleeding
12.05	Control of bleeding (non-endoscopic)
12.06	Chest wall procedures, NEC
12.07	Mediastinal procedures, NEC
12.08	Abdominal wall procedures, NEC
12.09	Retroperitoneal procedures, NEC
12.10	Genitourinary tract procedures, NEC
12.99	Other general region procedures

13	Hepatobiliary and Pancreas Procedures
13.01	Liver biopsy
13.02	Pancreaticobiliary biopsy
13.03	Diagnostic ERCP with or without biopsy
13.04	Hepatobiliary resection and ablation
13.05	Pancreatectomy
13.06	Cholecystectomy
13.07	Biliary and pancreatic calculus removal
13.08	Common bile duct sphincterotomy and stenting
13.09	Pancreatic and proximal biliary dilation and stenting
13.10	Hepatobiliary and pancreatic drainage
13.11	Liver transplant
13.12	Pancreas transplant
13.13	Hepatobiliary and pancreatic procedures, NEC
13.99	Other hepatobiliary and pancreas procedures

14	Imaging
14.01	Cardiac and coronary fluoroscopy
14.02	Fluoroscopic angiography (excluding coronary)
14.03	Fluoroscopic guidance for circulatory system procedures
14.04	Fluoroscopy of non-circulatory organs
14.05	Magnetic resonance imaging (MRI)
14.06	Computerized tomography (CT) with contrast
14.07	Computerized tomography (CT) without contrast
14.08	Ultrasonography
14.09	Plain radiography
14.10	Fluorescence imaging
14.99	Other imaging

15	Lymphatic and Hemic System Procedures
15.01	Lymph node biopsy
15.02	Lymph node excision (therapeutic)
15.03	Lymph node dissection
15.04	Thymectomy
15.05	Splenectomy
15.06	Spleen procedures (excluding splenectomy)
15.07	Bone marrow biopsy
15.08	Bone marrow aspiration (therapeutic)
15.09	Thymus transplant
15.10	Spleen transplant
15.11	Lymphatic procedures, NEC
15.99	Other lymphatic and hemic system procedures

16	Measurement and Monitoring
16.01	Arterial oxygen saturation monitoring
16.02	Peripheral arterial pressure monitoring
16.03	Pulmonary arterial pressure monitoring
16.04	Cardiac stress tests
16.05	Measurement during cardiac catheterization
16.06	Pacemaker and defibrillator interrogation
16.07	Electrocardiogram (ECG)
16.08	Cardiac monitoring
16.09	Electrophysiologic studies
16.10	Other cardiovascular system measurement and monitoring
16.11	Electroencephalogram (EEG)
16.12	ICP and other CNS monitoring (excluding EEG)
16.13	Monitoring of peripheral nerves
16.14	Pulmonary function tests
16.15	Measurement and monitoring, NEC
16.99	Other measurement and monitoring

17	Mental Health Therapy
17.01	Pharmacotherapy for mental health (excluding substance use)
17.02	Psychotherapy for mental health (excluding substance use)
17.03	Electroconvulsive therapy
17.04	Crisis intervention for mental health
17.05	Mental health procedures, NEC
17.99	Other mental health therapy

18	Male Reproductive System Procedures
18.01	Circumcision
18.02	Penis procedures (excluding circumcision)
18.03	Prostatectomy
18.04	Prostate and seminal vesicle procedures (excluding prostatectomy)
18.05	Male perineum procedures
18.06	Male reproductive system transplant
18.07	Male reproductive system procedures, NEC
18.99	Other male reproductive system procedures

19	Musculoskeletal, Subcutaneous Tissue, and Fascia Procedures
19.01	Arthrocentesis
19.02	Bone and joint biopsy
19.03	Subcutaneous tissue, fascia, and muscle biopsy
19.04	Incision and drainage of musculoskeletal tissue and joints
19.05	Incision and drainage of subcutaneous tissue and fascia
19.06	Knee arthroplasty
19.07	Hip arthroplasty
19.08	Arthroplasty of other joint (excluding knee and hip)
19.09	Fixation of upper extremity bones
19.10	Femur fixation
19.11	Fixation of leg and foot bones
19.12	Bone fixation (excluding extremities)
19.13	Spine fusion
19.14	Joint fusion (excluding spine)
19.15	Closed reduction of bones and joints
19.16	Vertebral discectomy
19.17	Joint tissue excision (excluding discectomy)
19.18	Bone excision
19.19	Muscle, tendon, bursa, and ligament excision
19.20	Subcutaneous tissue and fascia excision
19.21	Perineal muscle laceration repair (2nd degree obstetrical and other)
19.22	Tendon, muscle, bursa, and ligament repair (excluding perineal)
19.23	Toe and mid foot amputation
19.24	Below knee amputation
19.25	Above knee and other proximal lower extremity amputation
19.26	Finger and other upper extremity amputation
19.27	Hand transplant
19.28	Subcutaneous tissue and fascia procedures, NEC
19.29	Musculoskeletal device procedures, NEC
19.30	Musculoskeletal procedures, NEC
19.99	Other musculoskeletal, subcutaneous tissue, and fascia procedures

20	Nuclear Medicine
20.01	Planar nuclear medicine imaging
20.02	Tomographic nuclear medicine imaging
20.03	Radionuclide therapy and non-imaging procedures
20.04	Positron emission tomographic (PET) imaging
20.99	Other nuclear medicine

21	Osteopathic Treatment
21.01	Osteopathic treatment
21.99	Other osteopathic treatment

22	Other Procedures
22.01	Robotic-assisted procedures
22.02	Computer-assisted procedures
22.03	Fluorescence-guided procedures
22.04	Isolation procedures
22.05	Therapeutic massage and related procedures
22.99	Other procedures

23	Pregnancy-Related Procedures
23.01	Fetal heart rate monitoring
23.02	Spontaneous vaginal delivery
23.03	Cesarean section
23.04	Assisted vaginal delivery
23.05	Episiotomy
23.06	Removal of placenta and other retained products of conception
23.07	Removal of ectopic pregnancy
23.08	Abortion
23.09	Pregnancy and fetal procedures, NEC
23.99	Other pregnancy-related procedures

24	Dressings and Other Placements
24.01	Immobilization by splint or other external device
24.02	Packing and dressing procedures
24.99	Other dressings and placements

25	Peripheral Nervous System Procedures
25.01	Lumbosacral nerve decompression
25.02	Cervicothoracic nerve decompression
25.03	Peripheral nerve decompression (excluding lumbosacral and cervicothoracic)
25.04	Nerve repair
25.05	Peripheral nerve denervation
25.06	Peripheral nerve procedures, NEC
25.99	Other peripheral nervous system procedures

26	Radiation Therapy
26.01	Beam radiation
26.02	Brachytherapy
26.03	Stereotactic radiosurgery
26.04	Radiation therapy, NEC
26.99	Other radiation therapy

27	Respiratory System Procedures
27.01	Bronchoscopy (diagnostic)
27.02	Lung, pleura, or diaphragm biopsy (non-endoscopic)
27.03	Thoracentesis (diagnostic)
27.04	Bronchoscopy (therapeutic)
27.05	Chest tube placement and therapeutic thoracentesis
27.06	Open and thoracoscopic pleural drainage
27.07	Airway intubation
27.08	Lung, pleura, or diaphragm resection (open and thoracoscopic)
27.09	Bronchoscopic excision and fulguration
27.10	Tracheostomy
27.11	Diaphragmatic hernia repair
27.12	Release of lung and pleura
27.13	Lung transplant
27.14	Respiratory system procedures, NEC
27.99	Other respiratory system procedures

28	Rehabilitation, Evaluation, and Treatment
28.01	Physical, occupational, and respiratory therapy evaluation
28.02	Physical, occupational, and respiratory therapy treatment
28.03	Speech therapy evaluation
28.04	Speech therapy treatment
28.99	Other rehabilitation, evaluation, and treatments

29	Skin and Breast Procedures
29.01	Skin biopsy and diagnostic drainage
29.02	Incision and drainage of skin
29.03	Mastectomy and lumpectomy
29.04	Breast reconstruction
29.05	Perineal skin repair (1st degree obstetrical and other)
29.06	Skin laceration repair (excluding perineum)
29.07	Skin graft
29.08	Skin excision and debridement
29.09	Nail procedures
29.10	Skin and breast procedures, NEC
29.99	Other skin and breast procedures

30	Substance Use Disorder Treatment
30.01	Substance use detoxification
30.02	Pharmacotherapy for substance use
30.03	Psychotherapy for substance use
30.04	Counseling for substance use
30.99	Other substance use disorder treatments

31	Urinary System Procedures
31.01	Cystoscopy and ureteroscopy (including biopsy)
31.02	Kidney and other urinary tract biopsy (non-endoscopic)
31.03	Ureter and other urinary tract dilation
31.04	Removal of calculi and other matter from urinary tract
31.05	Nephrostomy and ureterostomy procedures (including stents)
31.06	Bladder catheterization and drainage
31.07	Urinary tract repair
31.08	Nephrectomy and ureterectomy
31.09	Cystectomy (including fulguration) and urethrectomy
31.10	Urinary diversion with anastomosis or ostomy
31.11	Kidney transplant
31.12	Urinary system procedures, NEC
31.99	Other urinary system procedures

32	Residual codes, unclassified, all E codes and surpressed codes due to <=50 observations
32.99	Residual codes, unclassified, all E codes and surpressed codes due to <=50 observations

Observations less than 50

Principal Diagnosis and Procedure subcategories with 50 observations or less are grouped into their Principal Diagnosis/Procedure Title (X.99) categories with the exception of those under Principal Diagnosis/Procedures found in Residual codes, unclassified, and all E codes which have no explicit subcategory.

County:

(Map of Oklahoma Counties)

The county of residence.

Regions:

(Map of Regions)

Region	Counties
Central	Cleveland, Oklahoma
Northeast	Adair, Cherokee, Craig, Creek, Delaware, Kay, Lincoln, Mayes, Muskogee, Noble, Nowata, Okfuskee, Okmulgee, Osage, Ottawa, Pawnee, Payne, Rogers, Sequoyah, Wagoner, Washington
Northwest	Alfalfa, Beaver, Blaine, Canadian, Cimarron, Custer, Dewey, Ellis, Garfield, Grant, Harper, Kingfisher, Logan, Major, Roger Mills, Texas, Woods, Woodward
Southeast	Atoka, Bryan, Choctaw, Coal, Haskell, Hughes, Johnston, Latimer, LeFlore, Marshall, McCurtain, McIntosh, Murray, Pittsburg, Pontotoc, Pottawatomie, Pushmataha, Seminole
Southwest	Beckham, Caddo, Carter, Comanche, Cotton, Garvin, Grady, Greer, Harmon, Jackson, Jefferson, Kiowa, Love, McClain, Stephens, Tillman, Washita
Tulsa	Tulsa

Race

The race categories used: White, African American, American Indian, Asian/Pacific Islander, and Other.