K51.513 vs K63.2
K51.513 (Left sided colitis with fistula) compared with K63.2 (Fistula of intestine), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. K63.2 carries an Excludes1 note covering K51.513: “fistula of intestine with ulcerative colitis (K51.013, K51.213, K51.313, K51.413, K51.513, K51.813, K51.913)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| K51.513Left sided colitis with fistula | K63.2Fistula of intestine | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | K00-K95 — Diseases of the Digestive System (K00-K95) |
| Definition | Left sided colitis with fistula is a billable ICD-10-CM diagnosis code (K51.513). | Fistula of intestine is a billable ICD-10-CM diagnosis code (K63.2). |
| Includes | noninfective inflammatory bowel disease | — |
| Use additional code | code to identify any associated fistulas, if applicable: anal fistula (K60.3-) anorectal fistula (K60.5-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources