ICD-10-CM 2027
ICD-10 code for Pouchitis
From the official ICD-10-CM alphabetic index entry “Pouchitis”. Page updated September 29, 2026.
About coding Pouchitis
The ICD-10-CM code for Pouchitis is K91.850 (Pouchitis).
Within K91.85 (complications of intestinal pouch), K91.850 is specifically for Pouchitis. Related codes cover other complications of intestinal pouch (K91.858).
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.
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 Pouchitis ICD-10 codes
What is the ICD-10 code for Pouchitis?
- K91.850 — Pouchitis.
Is K91.850 billable?
- Yes. K91.850 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K91.850 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K91.850 as a principal diagnosis.
Is K91.850 a CC or MCC?
- K91.850 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.