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ICD-10-CM 2027

ICD-10 code for ulcerative ileocolitis

K51.0

Ulcerative (chronic) pancolitis

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Ileocolitis › ulcerative”. Page updated September 29, 2026.

About coding ulcerative ileocolitis

The ICD-10-CM code for ulcerative ileocolitis is K51.0 (Ulcerative (chronic) pancolitis).

Within K51 (ulcerative colitis), K51.0 is specifically for ulcerative (chronic) pancolitis. Related codes cover ulcerative (chronic) proctitis (K51.2), ulcerative (chronic) rectosigmoiditis (K51.3), inflammatory polyps of colon (K51.4), left sided colitis (K51.5), other ulcerative colitis (K51.8) and unspecified (K51.9).

To report this condition, pick the subcode that matches the documentation: K51.00 (without complications) and K51.01 (with complications).

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).

Common questions about ulcerative ileocolitis ICD-10 codes

What is the ICD-10 code for ulcerative ileocolitis?

K51.0 — Ulcerative (chronic) pancolitis (a header code; report a more specific subcode).

Is K51.0 billable?

No. K51.0 is a header code. Report one of its more specific subcodes instead.