ICD-10-CM > K00-K95 > K55-K64 > K60 > K60.5 > K60.51 K60.51 Anorectal fistula, simple Non-Billable/Non-Specific Applicable To Low intersphincteric anorectal fistulaSuperficial anorectal fistula Codes K60.511Anorectal fistula, simple, initialK60.512Anorectal fistula, simple, persistentK60.513Anorectal fistula, simple, recurrentK60.519Anorectal fistula, simple, unspecified