ICD-10-CM 2027
ICD-10 code for left sided colitis
From the official ICD-10-CM alphabetic index entry “Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › left sided”. Page updated September 29, 2026.
About coding left sided colitis
The ICD-10-CM code for left sided colitis is K51.50 (Left sided colitis 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 K51.50.
Within K51.5, choose K51.50 (without complications) only when documentation doesn't support a more specific option: with complications (K51.51).
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 left sided colitis codes (official index)
- with
- abscess K51.514 — Left sided colitis with abscess
- complication K51.519 — Left sided colitis with unspecified complications
- specified NEC K51.518 — Left sided colitis with other complication
- fistula K51.513 — Left sided colitis with fistula
- obstruction K51.512 — Left sided colitis with intestinal obstruction
- rectal bleeding K51.511 — Left sided colitis with rectal bleeding
Common questions about left sided colitis ICD-10 codes
What is the ICD-10 code for left sided colitis?
- K51.50 — Left sided colitis without complications. More specific codes apply when the documentation supports them: K51.514, K51.519, K51.518, K51.513 and others below.
Is K51.50 billable?
- Yes. K51.50 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K51.50 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K51.50 as a principal diagnosis.
Is K51.50 a CC or MCC?
- K51.50 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.