ICD-10-CM 2027
ICD-10 code for omentum abscess
From the official ICD-10-CM alphabetic index entry “Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › omentum”. Page updated September 29, 2026.
About coding omentum abscess
The ICD-10-CM code for omentum abscess is K65.1 (Peritoneal abscess).
Within K65 (peritonitis), K65.1 is specifically for peritoneal abscess. Related codes cover generalized (acute) peritonitis (K65.0), spontaneous bacterial peritonitis (K65.2), Choleperitonitis (K65.3), sclerosing mesenteritis (K65.4), other peritonitis (K65.8) and unspecified (K65.9).
The conditions in its Excludes2 note aren't part of K65.1, but may be coded alongside it if the patient has both: pelvic abscess (extraperitoneal) (K6A.0-).
Use an additional code (B95-B97), to identify infectious agent, if known.
Common questions about omentum abscess ICD-10 codes
What is the ICD-10 code for omentum abscess?
- K65.1 — Peritoneal abscess.
Is K65.1 billable?
- Yes. K65.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K65.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K65.1 as a principal diagnosis.
Is K65.1 a CC or MCC?
- K65.1 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.