ICD-10 I15.9
Billable / SpecificSecondary hypertension, unspecified
About ICD-10-CM I15.9
ICD-10-CM code I15.9 represents Secondary hypertension, unspecified. This is a billable/specific code in the Circulatory System chapter (block I15). The 2026 edition of ICD-10-CM I15.9 became effective on October 1, 2025.
Medicare LCD Coverage for I15.9
Local Coverage Determinations (LCDs) from CMS MACs that list I15.9 as a covered diagnosis.
Showing top 10 of 36 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I15.9.
1 Cigna
4 Medicare
2 Aetna
CPT Codes Commonly Billed with I15.9
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.
Convert I15.9 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 |
|---|---|---|
| I15.9 | 40599 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I15.9
Other codes in section I10-I1A (Hypertensive diseases).
ICD-10 I15.9, Billing FAQ
Is ICD-10 code I15.9 billable? +
Yes, I15.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What ICD-9 codes does I15.9 map to? +
Per CMS GEMs, I15.9 maps to ICD-9 codes: 40599. 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 June 1, 2026.
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