ICD-10 I51.9
Billable / SpecificHeart disease, unspecified
About ICD-10-CM I51.9
ICD-10-CM code I51.9 represents Heart disease, unspecified. This is a billable/specific code in the Circulatory System chapter (block I51). The 2026 edition of ICD-10-CM I51.9 became effective on October 1, 2025.
Medicare LCD Coverage for I51.9
Local Coverage Determinations (LCDs) from CMS MACs that list I51.9 as a covered diagnosis.
Showing top 10 of 141 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I51.9.
1 Aetna
5 Medicare
CPT Codes Commonly Billed with I51.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 83090 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 83700 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 82172 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 86141 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 83701 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 83719 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 83721 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 83698 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 83695 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
- 83704 CMS LCD: Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment CMS LCD
Convert I51.9 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| I51.9 | 4299 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I51.9
Other codes in section I30-I5A (Other forms of heart disease).
ICD-10 I51.9, Billing FAQ
Is ICD-10 code I51.9 billable? +
Yes, I51.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What CPT codes are commonly billed with I51.9? +
Procedures frequently paired with I51.9 include: 83090, 83700, 82172, 86141, 83701.
What ICD-9 codes does I51.9 map to? +
Per CMS GEMs, I51.9 maps to ICD-9 codes: 4299. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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