ICD-10-CM 2027
ICD-10 code for ischiorectal abscess
From the official ICD-10-CM alphabetic index entry “Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › ischiorectal (fossa) (specified NEC)”. Page updated September 29, 2026.
About coding ischiorectal abscess
The ICD-10-CM code for ischiorectal abscess is K61.39 (Other ischiorectal abscess).
Within K61.3, choose K61.39 (Other ischiorectal abscess) only when documentation doesn't support a more specific option: horseshoe abscess (K61.31).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228), DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 06 (Diseases and Disorders of the Digestive System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about ischiorectal abscess ICD-10 codes
What is the ICD-10 code for ischiorectal abscess?
- K61.39 — Other ischiorectal abscess.
Is K61.39 billable?
- Yes. K61.39 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K61.39 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K61.39 as a principal diagnosis.
Is K61.39 a CC or MCC?
- No. K61.39 is neither a CC nor an MCC under MS-DRG v44.0.