K31.6 vs K63.2
K31.6 (Fistula of stomach and duodenum) 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 K31.6: “fistula of duodenum (K31.6)”
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
| K31.6Fistula of stomach and duodenum | 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 | Fistula of stomach and duodenum is a billable ICD-10-CM diagnosis code (K31.6). | Fistula of intestine is a billable ICD-10-CM diagnosis code (K63.2). |
| Includes | functional disorders of stomach Gastrocolic fistula Gastrojejunocolic fistula | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources