ICD-10 Chapters

Browse all ICD-10 chapters and their code ranges.

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Chapter 1

A00-B99

Certain infectious and parasitic diseases

Covers bacterial, viral, and parasitic infections including tuberculosis, HIV, hepatitis, and other communicable diseases.

Chapter 2

C00-D49

Neoplasms

Includes all types of malignant and benign neoplasms, organized by anatomical site and behavior.

Chapter 3

D50-D89

Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism

Covers disorders of blood cells, blood-forming organs, and immune mechanisms including anemias and coagulation defects.

Chapter 4

E00-E89

Endocrine, nutritional and metabolic diseases

Includes disorders of the endocrine glands, nutritional deficiencies, metabolic disorders, and diabetes mellitus.

Chapter 5

F01-F99

Mental, Behavioral and Neurodevelopmental disorders

Covers mental, behavioral, and neurodevelopmental disorders including dementia, substance use, schizophrenia, and mood disorders.

Chapter 6

G00-G99

Diseases of the nervous system

Includes diseases of the central and peripheral nervous system such as meningitis, Alzheimer's, Parkinson's, and epilepsy.

Chapter 7

H00-H59

Diseases of the eye and adnexa

Covers disorders of the eye and surrounding structures including glaucoma, cataracts, and visual disturbances.

Chapter 8

H60-H95

Diseases of the ear and mastoid process

Includes diseases of the ear and mastoid process such as otitis media, hearing loss, and vestibular disorders.

Chapter 9

I00-I99

Diseases of the circulatory system

Covers diseases of the heart and blood vessels including hypertension, ischemic heart disease, and cerebrovascular diseases.

Chapter 10

J00-J99

Diseases of the respiratory system

Includes diseases of the respiratory system such as influenza, pneumonia, COPD, asthma, and respiratory failure.

Chapter 11

K00-K95

Diseases of the digestive system

Covers diseases of the digestive system including disorders of the oral cavity, esophagus, stomach, intestines, liver, and pancreas.

Chapter 12

L00-L99

Diseases of the skin and subcutaneous tissue

Includes diseases of the skin and subcutaneous tissue such as infections, dermatitis, and other inflammatory conditions.

Chapter 13

M00-M99

Diseases of the musculoskeletal system and connective tissue

Covers diseases of the musculoskeletal system and connective tissue including arthropathies, dorsopathies, and osteoporosis.

Chapter 14

N00-N99

Diseases of the genitourinary system

Includes diseases of the genitourinary system such as kidney disease, urinary disorders, and disorders of male/female genital organs.

Chapter 15

O00-O9A

Pregnancy, childbirth and the puerperium

Covers conditions related to pregnancy, childbirth, and the puerperium including complications of pregnancy and delivery.

Chapter 16

P00-P96

Certain conditions originating in the perinatal period

Includes conditions originating in the perinatal period such as birth trauma, respiratory conditions, and infections in newborns.

Chapter 17

Q00-Q99

Congenital malformations, deformations and chromosomal abnormalities

Covers congenital malformations, deformations, and chromosomal abnormalities present at birth.

Chapter 18

R00-R99

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

Includes symptoms, signs, and abnormal clinical findings not elsewhere classified, organized by body system.

Chapter 19

S00-T88

Injury, poisoning and certain other consequences of external causes

Covers injuries, poisoning, and certain other consequences of external causes including fractures, burns, and toxic effects.

Chapter 20

V00-Y99

External causes of morbidity

Includes external causes of morbidity such as accidents, intentional self-harm, assault, and complications of medical care.

Chapter 21

Z00-Z99

Factors influencing health status and contact with health services

Covers factors influencing health status and contact with health services including examinations, screenings, and follow-up care.

Chapter 22

U00-U85

Codes for special purposes

Codes for special purposes (U00-U85)