ICD-10-CM Tabular Index · FY 2026 22 Chapters

2026 ICD-10-CM Codes List ICD-10-CM

The fiscal year 2026 ICD-10-CM classification contains 98,186 diagnosis codes, of which 74,719 are billable, organized into 22 chapters. Each chapter below links to its sections, code ranges, and individual codes, and the info icons preview what each chapter contains.

✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
22
Chapters
98,186
Diagnosis Codes
74,719
Billable Codes
A00–U85
Code Span
ICD-10-CM

Chapters 22 chapters · 98,186 codes

22 of 22 shown
Ch.Code RangeTitleCodesBillable
1A00–B99Certain infectious and parasitic diseases (A00–B99)1,3091,068
2C00–D49Neoplasms (C00–D49)2,1601,713
3D50–D89Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50–D89)419337
4E00–E89Endocrine, nutritional and metabolic diseases (E00–E89)1,267971
5F01–F99Mental and behavioural disorders (F01–F99)1,112871
6G00–G99Diseases of the nervous system (G00–G99)932700
7H00–H59Diseases of the eye and adnexa (H00–H59)3,4662,677
8H60–H95Diseases of the ear and mastoid process (H60–H95)871653
9I00–I99Diseases of the circulatory system (I00–I99)1,7981,427
10J00–J99Diseases of the respiratory system (J00–J99)471360
11K00–K95Diseases of the digestive system (K00–K95)1,109857
12L00–L99Diseases of the skin and subcutaneous tissue (L00–L99)1,2061,000
13M00–M99Diseases of the musculoskeletal system and connective tissue (M00–M99)8,6746,665
14N00–N99Diseases of the genitourinary system (N00–N99)1,044836
15O00–O9APregnancy, childbirth and the puerperium (O00-O9A)3,0232,437
16P00–P96Certain conditions originating in the perinatal period (P00–P96)565463
17Q00–Q99Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)1,086894
18R00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99)962773
19S00–T88Injury, poisoning and certain other consequences of external causes (S00–T88)54,26141,142
20V00–Y99External causes of morbidity and mortality (V01–Y99)10,6027,461
21Z00–Z99Factors influencing health status and contact with health services (Z00–Z99)1,8441,411
22U00–U49Codes for Special Purposes (U00–U85)53

The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.

Questions About This Page

How many ICD-10-CM codes are there in FY 2026?

The FY 2026 classification contains 98,186 diagnosis codes across 22 chapters. Of these, 74,719 are billable codes specific enough to submit on claims, and the rest are category headers that group them.

How is the ICD-10-CM code set organized?

Codes are grouped first by chapter, which covers a body system or type of condition, then by section, a range of related categories, and finally by three character category. Every level on this page links one step deeper until you reach the individual code.

Which chapter has the most codes?

Injury, poisoning and certain other consequences of external causes (S00–T88) is the largest chapter with 54,261 codes, driven by the characters that carry laterality, encounter type, and other detail.

Related References

ICD-10-CM Code LookupMS-DRG ReferenceMedicare Code EditsPOA Exempt Codes

Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.