ICD-10-CM 2027
ICD-10 code for Subphrenic abscess
From the official ICD-10-CM alphabetic index entry “Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › subphrenic”. Page updated September 29, 2026.
About coding Subphrenic abscess
The ICD-10-CM code for Subphrenic abscess is K65.1 (Peritoneal abscess). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K65.1.
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.
More specific Subphrenic abscess codes (official index)
Common questions about Subphrenic abscess ICD-10 codes
What is the ICD-10 code for Subphrenic abscess?
- K65.1 — Peritoneal abscess. More specific codes apply when the documentation supports them: O86.03, T81.43.
What is the ICD-10 code for postoperative subphrenic abscess?
- T81.43 — Infection following a procedure, organ and space surgical site (header code; choose a more specific subcode).
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.