ICD-10-CM 2027
ICD-10 code for ulcerative chronic proctitis
Ulcerative (chronic) proctitis without complications
From the official ICD-10-CM alphabetic index entry “Proctitis › ulcerative (chronic)”. Page updated September 29, 2026.
About coding ulcerative chronic proctitis
The ICD-10-CM code for ulcerative chronic proctitis is K51.20 (Ulcerative (chronic) proctitis without complications). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K51.20.
Within K51.2, choose K51.20 (without complications) only when documentation doesn't support a more specific option: with complications (K51.21).
Use an additional code to identify any associated fistulas, if applicable: anal fistula (K60.3-), anorectal fistula (K60.5-) and rectal fistula (K60.4-). Use an additional code to identify manifestations, such as: pyoderma gangrenosum (L88).
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.
More specific ulcerative chronic proctitis codes (official index)
- with
- complication K51.219 — Ulcerative (chronic) proctitis with unspecified complications
- abscess K51.214 — Ulcerative (chronic) proctitis with abscess
- fistula K51.213 — Ulcerative (chronic) proctitis with fistula
- obstruction K51.212 — Ulcerative (chronic) proctitis with intestinal obstruction
- rectal bleeding K51.211 — Ulcerative (chronic) proctitis with rectal bleeding
- specified NEC K51.218 — Ulcerative (chronic) proctitis with other complication
Common questions about ulcerative chronic proctitis ICD-10 codes
What is the ICD-10 code for ulcerative chronic proctitis?
- K51.20 — Ulcerative (chronic) proctitis without complications. More specific codes apply when the documentation supports them: K51.219, K51.214, K51.213, K51.212 and others below.
Is K51.20 billable?
- Yes. K51.20 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K51.20 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K51.20 as a principal diagnosis.
Is K51.20 a CC or MCC?
- K51.20 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.