ICD-10-CM 2027
ICD-10 code for sclerosing mesenteric idiopathic fibrosis
From the official ICD-10-CM alphabetic index entry “Fibrosis, fibrotic › sclerosing mesenteric (idiopathic)”. Page updated September 29, 2026.
About coding sclerosing mesenteric idiopathic fibrosis
The ICD-10-CM code for sclerosing mesenteric idiopathic fibrosis is K65.4 (Sclerosing mesenteritis).
Within K65 (peritonitis), K65.4 is specifically for sclerosing mesenteritis. Related codes cover generalized (acute) peritonitis (K65.0), peritoneal abscess (K65.1), spontaneous bacterial peritonitis (K65.2), Choleperitonitis (K65.3), other peritonitis (K65.8) and unspecified (K65.9).
Use an additional code (B95-B97), to identify infectious agent, if known.
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.
Common questions about sclerosing mesenteric idiopathic fibrosis ICD-10 codes
What is the ICD-10 code for sclerosing mesenteric idiopathic fibrosis?
- K65.4 — Sclerosing mesenteritis.
Is K65.4 billable?
- Yes. K65.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K65.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K65.4 as a principal diagnosis.
Is K65.4 a CC or MCC?
- K65.4 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.