ICD-10-CM · Chapter 11 · K00-K95
K37 Unspecified appendicitis
Excludes 1 (cannot be coded together)
- unspecified appendicitis with peritonitis (K35.2-, K35.3-)
This category is a complete, billable diagnosis code.
No additional specificity is required — submit K37 directly on claims and documentation without a subcode extension.
Last reviewed: September 2026