ICD-10-CM > K00-K95 > K55-K64 > K61 K61 Abscess of anal and rectal regions Non-Billable/Non-Specific Includes abscess of anal and rectal regionscellulitis of anal and rectal regions Codes K61.0Anal abscessK61.1Rectal abscessK61.2Anorectal abscessK61.3Ischiorectal abscessK61.31Horseshoe abscessK61.39Other ischiorectal abscessK61.4Intrasphincteric abscessK61.5Supralevator abscess