ICD-10 I51.8
Non-Billable HeaderOther ill-defined heart diseases
About ICD-10-CM I51.8
ICD-10-CM code I51.8 represents Other ill-defined heart diseases. This is a non-billable header code in the Circulatory System chapter (block I51). The 2026 edition of ICD-10-CM I51.8 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.
Medicare LCD Coverage for I51.8
Local Coverage Determinations (LCDs) from CMS MACs that list I51.8 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 I51.8.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but I51.8 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with I51.8
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 I51.8
Other codes in section I30-I5A (Other forms of heart disease).
ICD-10 I51.8, Billing FAQ
Is ICD-10 code I51.8 billable? +
No, I51.8 is a non-billable header code. Use a more specific child code from block I51 when submitting claims.
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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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