ICD-10 K31
Non-Billable HeaderOther diseases of stomach and duodenum
About ICD-10-CM K31
ICD-10-CM code K31 represents Other diseases of stomach and duodenum. This is a non-billable header code in the Digestive System chapter (block K31). The 2026 edition of ICD-10-CM K31 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 2 Excludes
Not included here, the excluded code is not part of K31, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
- diverticulum of duodenum (K57.00-K57.13)
Includes
- functional disorders of stomach
Medicare LCD Coverage for K31
Local Coverage Determinations (LCDs) from CMS MACs that list K31 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 K31.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but K31 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with K31
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 K31
Other codes in section K20-K31 (Diseases of esophagus, stomach and duodenum).
ICD-10 K31, Billing FAQ
Is ICD-10 code K31 billable? +
No, K31 is a non-billable header code. Use a more specific child code from block K31 when submitting claims.
What codes are Type 2 Excludes for K31? +
Type 2 Excludes (may be coded together when both conditions exist): diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43); diverticulum of duodenum (K57.00-K57.13)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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