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K51

Non-billable

Ulcerative colitis

K51 is the ICD-10-CM code for Ulcerative colitis. It is a non-billable category code — use a more specific child code such as K51.0 for billing.

Status
Header (non-billable)
Chapter
K00-K95
Subcodes
7
Edition
FY2026

K00-K95 Diseases of the digestive system

Excludes1 — not coded here

  • •Crohn's disease [regional enteritis] (K50.-)

Use additional code

  • •code to identify any associated fistulas, if applicable:
  • •anal fistula (K60.3-)
  • •anorectal fistula (K60.5-)
  • •rectal fistula (K60.4-)
  • •code to identify manifestations, such as:
  • •pyoderma gangrenosum (L88)

Frequently asked questions

What is ICD-10 code K51?
K51 is the ICD-10-CM code for "Ulcerative colitis". It falls under K00-K95 Diseases of the digestive system.
Is K51 a billable code?
No — K51 is a non-billable header code. Use a more specific child code (such as K51.0) for billing.
What are the subcodes of K51?
K51 has 7 more specific child codes, including K51.0, K51.2, K51.3.
What is excluded from K51?
Excludes1 (not coded here): Crohn's disease [regional enteritis] (K50.-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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