Diseases of appendix (K35-K38) ICD-10-CM
The K35–K38 section covers diseases of appendix with 29 ICD-10-CM diagnosis codes, of which 21 are billable in fiscal year 2027. The section is organized into the 4 code ranges listed below.
Code Ranges in This Section 4 ranges · 29 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| K35 | Acute appendicitis (K35) | 20 | 13 |
| K36 | Other appendicitis (K36) | 1 | 1 |
| K37 | Unspecified appendicitis (K37) | 1 | 1 |
| K38 | Other diseases of appendix (K38) | 7 | 6 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the K35–K38 Code Range
These conditions affect the appendix. Appendicitis means acute inflammation of the appendix.
K35 separates acute appendicitis with generalized peritonitis, localized peritonitis, or other and unspecified acute forms. K36 covers other appendicitis, while K37 covers unspecified appendicitis.
K38 divides other appendix diseases into named conditions, other specified diseases, and unspecified disease.
Questions About This Page
How many codes are in the K35-K38 range?
The K35-K38 range contains 29 ICD-10-CM diagnosis codes in FY 2027. 21 of them are billable, and the rest are category headers that organize the section.
What conditions does K35-K38 cover?
The range covers diseases of appendix. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
