K52.831 Collagenous colitis

Billable ICD-10-CM code, FY2026.

Risk adjustment (HCC)

• RxHCC V08: HCC 67 — Inflammatory Bowel Disease

MS-DRG index

Defines the logic of DRG(s) 391-392 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 558.9 Other and unspecified noninfectious gastroenteritis and colitis (approximate)

Diagnosis Index entries for K52.831

• Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › collagenous

Nearby codes

• K52.3 Indeterminate colitis
• K52.8 Other specified noninfective gastroenteritis and colitis
• K52.81 Eosinophilic gastritis or gastroenteritis
• K52.82 Eosinophilic colitis
• K52.83 Microscopic colitis
• K52.831 Collagenous colitis (this code)
• K52.832 Lymphocytic colitis
• K52.838 Other microscopic colitis
• K52.839 Microscopic colitis, unspecified
• K52.89 Other specified noninfective gastroenteritis and colitis
• K52.9 Noninfective gastroenteritis and colitis, unspecified