ICD-10-CM 2027
ICD-10 code for rectum cellulitis
From the official ICD-10-CM alphabetic index entry “Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) › rectum”. Page updated September 29, 2026.
About coding rectum cellulitis
The ICD-10-CM code for rectum cellulitis is K61.1 (Rectal abscess).
Within K61 (abscess of anal and rectal regions), K61.1 is specifically for rectal abscess. Related codes cover anal abscess (K61.0), Anorectal abscess (K61.2), ischiorectal abscess (K61.3), Intrasphincteric abscess (K61.4) and Supralevator abscess (K61.5).
Don't report K61.1 together with the conditions in its Excludes1 note: ischiorectal abscess (K61.39).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Don't confuse with (Excludes1 for K61.1)
- ischiorectal abscess (K61.39)
Common questions about rectum cellulitis ICD-10 codes
What is the ICD-10 code for rectum cellulitis?
- K61.1 — Rectal abscess.
Is K61.1 billable?
- Yes. K61.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K61.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K61.1 as a principal diagnosis.
Is K61.1 a CC or MCC?
- K61.1 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.