K91.850 Pouchitis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Inflammation of internal ileoanal pouch

Applies from K91 Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified

Excludes2 (not included here)

• complications of artificial opening of digestive system (K94.-)
• complications of bariatric procedures (K95.-)
• gastrojejunal ulcer (K28.-)
• postprocedural (radiation) retroperitoneal abscess (K68.11)
• radiation colitis (K52.0)
• radiation gastroenteritis (K52.0)
• radiation proctitis (K62.7)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 463 — Artificial Openings for Feeding or Elimination
• CMS-HCC V22: HCC 188 — Artificial Openings for Feeding or Elimination
• ESRD V24: HCC 188

MS-DRG index

Defines the logic of DRG(s) 393-395 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 569.71 Pouchitis

Code annotations containing back-references to K91.850

Back-references to K91

• Type 2 Excludes: T81 Complications of procedures, not elsewhere classified ("intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-)")

Diagnosis Index entries for K91.850

• Inflammation, inflamed, inflammatory (with exudation) › ileoanal (internal) pouch
• Inflammation, inflamed, inflammatory (with exudation) › intestinal pouch
• Pouchitis

Nearby codes

• K91.83 Postprocedural hepatorenal syndrome
• K91.84 Postprocedural hemorrhage of a digestive system organ or structure following a procedure
• K91.840 Postprocedural hemorrhage of a digestive system organ or structure following a digestive system procedure
• K91.841 Postprocedural hemorrhage of a digestive system organ or structure following other procedure
• K91.85 Complications of intestinal pouch
• K91.850 Pouchitis (this code)
• K91.858 Other complications of intestinal pouch
• K91.86 Retained cholelithiasis following cholecystectomy
• K91.87 Postprocedural hematoma and seroma of a digestive system organ or structure following a procedure
• K91.870 Postprocedural hematoma of a digestive system organ or structure following a digestive system procedure
• K91.871 Postprocedural hematoma of a digestive system organ or structure following other procedure