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Compare/K51 vs K58

K51 vs K58

K51 (Ulcerative colitis) compared with K58 (Irritable bowel syndrome), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. K51 carries an Excludes1 note covering K58: “irritable bowel syndrome (K58.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

K51Ulcerative colitisK58Irritable bowel syndrome
Billing statusNon-billable header

Report instead: K51.00, K51.011, K51.012, K51.013, K51.014

Non-billable header

Report instead: K58.0, K58.1, K58.2, K58.8, K58.9

ClassificationK00-K95 — Diseases of the Digestive System (K00-K95)K00-K95 — Diseases of the Digestive System (K00-K95)
DefinitionUlcerative colitis is a non-billable ICD-10-CM category code (K51).Irritable bowel syndrome is a non-billable ICD-10-CM category code (K58).
Includes
noninfective inflammatory bowel disease
irritable colon
spastic colon
Use additional code
code to identify any associated fistulas, if applicable:
anal fistula (K60.3-)
anorectal fistula (K60.5-)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources