ICD-10 I25.9
Billable / SpecificChronic ischemic heart disease, unspecified
About ICD-10-CM I25.9
ICD-10-CM code I25.9 represents Chronic ischemic heart disease, unspecified. This is a billable/specific code in the Circulatory System chapter (block I25). The 2026 edition of ICD-10-CM I25.9 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under I25.9. Per CMS ICD-10-CM Tabular 2026.
- Ischemic heart disease (chronic) NOS
Medicare LCD Coverage for I25.9
Local Coverage Determinations (LCDs) from CMS MACs that list I25.9 as a covered diagnosis.
Showing top 10 of 360 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I25.9.
1 Aetna
3 Cigna
5 Medicare
CPT Codes Commonly Billed with I25.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 93281 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93280 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93296 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93279 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93283 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93261 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93288 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93282 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93724 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
- 93286 CMS LCD: Billing and Coding: Cardiac Rhythm Device Evaluation CMS LCD
Convert I25.9 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 |
|---|---|---|
| I25.9 | 4148 | 10000 |
| I25.9 | 4149 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I25.9
Other codes in section I20-I25 (Ischemic heart diseases).
ICD-10 I25.9, Billing FAQ
Is ICD-10 code I25.9 billable? +
Yes, I25.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to I25.9? +
ICD-10 I25.9 includes: Ischemic heart disease (chronic) NOS.
What CPT codes are commonly billed with I25.9? +
Procedures frequently paired with I25.9 include: 93281, 93280, 93296, 93279, 93283.
What ICD-9 codes does I25.9 map to? +
Per CMS GEMs, I25.9 maps to ICD-9 codes: 4148, 4149. 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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