ICD-10-CM Code Lookup
Look up official ICD-10-CM diagnosis codes by number or condition, or browse the full classification by chapter below.
- Current release
- FY 2027 effective October 1, 2026
- Active codes
- 98,403 active codes
- Maintainer
- Maintained by CDC NCHS and CMS
Browse by Chapter
ICD-10-CM organizes diagnosis codes into 22 chapters. Each chapter title and code range below is the official CDC/NCHS classification for FY 2027.
- Ch. 1 Certain infectious and parasitic diseases A00–B99
- Ch. 2 Neoplasms C00–D49
- Ch. 3 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism D50–D89
- Ch. 4 Endocrine, nutritional and metabolic diseases E00–E89
- Ch. 5 Mental, Behavioral and Neurodevelopmental disorders F01–F99
- Ch. 6 Diseases of the nervous system G00–G99
- Ch. 7 Diseases of the eye and adnexa H00–H59
- Ch. 8 Diseases of the ear and mastoid process H60–H95
- Ch. 9 Diseases of the circulatory system I00–I99
- Ch. 10 Diseases of the respiratory system J00–J99
- Ch. 11 Diseases of the digestive system K00–K95
- Ch. 12 Diseases of the skin and subcutaneous tissue L00–L99
- Ch. 13 Diseases of the musculoskeletal system and connective tissue M00–M99
- Ch. 14 Diseases of the genitourinary system N00–N99
- Ch. 15 Pregnancy, childbirth and the puerperium O00–O9A
- Ch. 16 Certain conditions originating in the perinatal period P00–P96
- Ch. 17 Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders Q00–QA1
- Ch. 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified R00–R99
- Ch. 19 Injury, poisoning and certain other consequences of external causes S00–T88
- Ch. 20 External causes of morbidity V00–Y99
- Ch. 21 Factors influencing health status and contact with health services Z00–Z99
- Ch. 22 Codes for special purposes U00–U49