US diagnosis codes · FY2026
ICD-10-CM code lookup
ICD-10-CM is the United States’ clinical modification of the WHO ICD-10, used for diagnosis coding on claims and in records. Search all 74,706 complete codes, or browse the 22 chapters below.
How ICD-10-CM codes are built
Three to seven characters; only a complete code can be billed.
- The first three characters are the category (E11 Type 2 diabetes mellitus). A category with subdivisions is not a billable code on its own.
- Characters 4–6 add detail: site, cause, severity, laterality (E11.9, E11.65).
- Some chapters, injuries above all, require a 7th character for the encounter: A initial, D subsequent, S sequela, with placeholder X where a code is shorter (S93.401A).
- ICD-10-CM is more specific than the international WHO ICD-10. If you work outside the US, see WHO ICD-10 or your national edition, such as ICD-10-SE.
Chapters
- A00-B99Certain infectious and parasitic diseasesChapter 1
- C00-D49NeoplasmsChapter 2
- D50-D89Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanismChapter 3
- E00-E89Endocrine, nutritional and metabolic diseasesChapter 4
- F01-F99Mental and behavioural disordersChapter 5
- G00-G99Diseases of the nervous systemChapter 6
- H00-H59Diseases of the eye and adnexaChapter 7
- H60-H95Diseases of the ear and mastoid processChapter 8
- I00-I99Diseases of the circulatory systemChapter 9
- J00-J99Diseases of the respiratory systemChapter 10
- K00-K95Diseases of the digestive systemChapter 11
- L00-L99Diseases of the skin and subcutaneous tissueChapter 12
- M00-M99Diseases of the musculoskeletal system and connective tissueChapter 13
- N00-N99Diseases of the genitourinary systemChapter 14
- O00-O9APregnancy, childbirth and the puerperiumChapter 15
- P00-P96Certain conditions originating in the perinatal periodChapter 16
- Q00-Q99Congenital malformations, deformations and chromosomal abnormalitiesChapter 17
- R00-R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedChapter 18
- S00-T88Injury, poisoning and certain other consequences of external causesChapter 19
- V00-Y99External causes of morbidity and mortalityChapter 20
- Z00-Z99Factors influencing health status and contact with health servicesChapter 21
- U00-U85Codes for special purposesChapter 22
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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