ICD-10-CM diagnosis codes: browse all 22 chapters
The ICD-10-CM tabular list organises every diagnosis code into 22 chapters, then into blocks of related categories. Browse the tree below, or search from the home page.
This index publishes 12,815 of the 98,186 codes in the release. All codes up to 4 characters, plus chapter(s) 5 at full depth, plus every code already published.
- A00-B99Chapter 1: Certain infectious and parasitic diseases891 codes
- C00-D49Chapter 2: Neoplasms918 codes
- D50-D89Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism213 codes
- E00-E89Chapter 4: Endocrine, nutritional and metabolic diseases422 codes
- F01-F99Chapter 5: Mental, Behavioral and Neurodevelopmental disorders1,112 codes
- G00-G99Chapter 6: Diseases of the nervous system392 codes
- H00-H59Chapter 7: Diseases of the eye and adnexa275 codes
- H60-H95Chapter 8: Diseases of the ear and mastoid process148 codes
- I00-I99Chapter 9: Diseases of the circulatory system463 codes
- J00-J99Chapter 10: Diseases of the respiratory system292 codes
- K00-K95Chapter 11: Diseases of the digestive system497 codes
- L00-L99Chapter 12: Diseases of the skin and subcutaneous tissue432 codes
- M00-M99Chapter 13: Diseases of the musculoskeletal system and connective tissue614 codes
- N00-N99Chapter 14: Diseases of the genitourinary system531 codes
- O00-O9AChapter 15: Pregnancy, childbirth and the puerperium484 codes
- P00-P96Chapter 16: Certain conditions originating in the perinatal period403 codes
- Q00-QA0Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders706 codes
- R00-R99Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified467 codes
- S00-T88Chapter 19: Injury, poisoning and certain other consequences of external causes1,286 codes
- V00-Y99Chapter 20: External causes of morbidity1,600 codes
- Z00-Z99Chapter 21: Factors influencing health status and contact with health services664 codes
- U00-U85Chapter 22: Codes for special purposes5 codes
Source
ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.