ICD-10-CM 2027
ICD-10 code for spontaneous bacterial peritonitis
From the official ICD-10-CM alphabetic index entry “Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) › spontaneous bacterial”. Page updated September 29, 2026.
About coding spontaneous bacterial peritonitis
The ICD-10-CM code for spontaneous bacterial peritonitis is K65.2 (Spontaneous bacterial peritonitis).
Within K65 (peritonitis), K65.2 is specifically for spontaneous bacterial peritonitis. Related codes cover generalized (acute) peritonitis (K65.0), peritoneal abscess (K65.1), Choleperitonitis (K65.3), sclerosing mesenteritis (K65.4), other peritonitis (K65.8) and unspecified (K65.9).
Don't report K65.2 together with the conditions in its Excludes1 note: bacterial peritonitis NOS (K65.9).
Use an additional code (B95-B97), to identify infectious agent, if known.
Don't confuse with (Excludes1 for K65.2)
- bacterial peritonitis NOS (K65.9)
Common questions about spontaneous bacterial peritonitis ICD-10 codes
What is the ICD-10 code for spontaneous bacterial peritonitis?
- K65.2 — Spontaneous bacterial peritonitis.
Is K65.2 billable?
- Yes. K65.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K65.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K65.2 as a principal diagnosis.
Is K65.2 a CC or MCC?
- K65.2 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.