ICD-10 K59
Non-Billable HeaderOther functional intestinal disorders
About ICD-10-CM K59
ICD-10-CM code K59 represents Other functional intestinal disorders. This is a non-billable header code in the Digestive System chapter (block K59). The 2026 edition of ICD-10-CM K59 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 1 Excludes
Pure excludes, these codes can never be coded together with K59. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- change in bowel habit NOS (R19.4)
- intestinal malabsorption (K90.-)
- psychogenic intestinal disorders (F45.8)
Type 2 Excludes
Not included here, the excluded code is not part of K59, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- functional disorders of stomach (K31.-)
Medicare LCD Coverage for K59
Local Coverage Determinations (LCDs) from CMS MACs that list K59 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing K59.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but K59 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with K59
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To K59
Other codes in section K55-K64 (Other diseases of intestines).
ICD-10 K59, Billing FAQ
Is ICD-10 code K59 billable? +
No, K59 is a non-billable header code. Use a more specific child code from block K59 when submitting claims.
What codes are Type 1 Excludes for K59? +
Type 1 Excludes (never code together with K59): change in bowel habit NOS (R19.4); intestinal malabsorption (K90.-); psychogenic intestinal disorders (F45.8)
What codes are Type 2 Excludes for K59? +
Type 2 Excludes (may be coded together when both conditions exist): functional disorders of stomach (K31.-)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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