ICD-10-CM > K00-K95 > K55-K64 > K60 > K60.4 K60.4 Rectal fistula Non-Billable/Non-Specific Applicable To Fistula of rectum to skin Code First , if applicable:Crohn's disease (K50.-)ulcerative colitis (K51.-) Type 1 Excludes congenital fistula (Q43.6)rectovaginal fistula (N82.3)vesicorectal fistual (N32.1) Codes K60.40Rectal fistula, unspecifiedK60.41Rectal fistula, simpleK60.411Rectal fistula, simple, initialK60.412Rectal fistula, simple, persistentK60.413Rectal fistula, simple, recurrentK60.419Rectal fistula, simple, unspecifiedK60.42Rectal fistula, complexK60.421Rectal fistula, complex, initialK60.422Rectal fistula, complex, persistentK60.423Rectal fistula, complex, recurrentK60.429Rectal fistula, complex, unspecified