ICD-10-CM 2027
ICD-10 code for Collagenous colitis
From the official ICD-10-CM alphabetic index entry “Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › collagenous”. Page updated September 29, 2026.
About coding Collagenous colitis
The ICD-10-CM code for Collagenous colitis is K52.831 (Collagenous colitis).
Within K52.83 (microscopic colitis), K52.831 is specifically for Collagenous colitis. Related codes cover lymphocytic colitis (K52.832), other microscopic colitis (K52.838) and unspecified (K52.839).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), 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 Collagenous colitis ICD-10 codes
What is the ICD-10 code for Collagenous colitis?
- K52.831 — Collagenous colitis.
Is K52.831 billable?
- Yes. K52.831 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K52.831 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K52.831 as a principal diagnosis.
Is K52.831 a CC or MCC?
- No. K52.831 is neither a CC nor an MCC under MS-DRG v44.0.