ICD-10-CM 2027
ICD-10 code for colon fistula
From the official ICD-10-CM alphabetic index entry “Fistula (cutaneous) › colon”. Page updated September 29, 2026.
About coding colon fistula
The ICD-10-CM code for colon fistula is K63.2 (Fistula of intestine).
Within K63 (other diseases of intestine), K63.2 is specifically for fistula of intestine. Related codes cover abscess of intestine (K63.0), perforation of intestine (nontraumatic) (K63.1), ulcer of intestine (K63.3), Enteroptosis (K63.4), polyp of colon (K63.5), other specified diseases of intestine (K63.8) and disease of intestine, unspecified (K63.9).
Don't report K63.2 together with the conditions in its Excludes1 note: fistula of duodenum (K31.6), fistula of intestine with Crohn's disease (K50.013, K50.113, K50.813, K50.913,) and fistula of intestine with ulcerative colitis (K51.013, K51.213, K51.313, K51.413, K51.513, K51.813, K51.913).
The conditions in its Excludes2 note aren't part of K63.2, but may be coded alongside it if the patient has both: fistula of anal and rectal regions (K60.-), fistula of appendix (K38.3), intestinal-genital fistula, female (N82.2-N82.4) and vesicointestinal fistula (N32.1).
Don't confuse with (Excludes1 for K63.2)
Common questions about colon fistula ICD-10 codes
What is the ICD-10 code for colon fistula?
- K63.2 — Fistula of intestine.
Is K63.2 billable?
- Yes. K63.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K63.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K63.2 as a principal diagnosis.
Is K63.2 a CC or MCC?
- K63.2 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.