ICD-10 I65.9
Billable / SpecificOcclusion and stenosis of unspecified precerebral artery
About ICD-10-CM I65.9
ICD-10-CM code I65.9 represents Occlusion and stenosis of unspecified precerebral artery. This is a billable/specific code in the Circulatory System chapter (block I65). The 2026 edition of ICD-10-CM I65.9 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under I65.9. Per CMS ICD-10-CM Tabular 2026.
- Occlusion and stenosis of precerebral artery NOS
Medicare LCD Coverage for I65.9
Local Coverage Determinations (LCDs) from CMS MACs that list I65.9 as a covered diagnosis.
Showing top 10 of 129 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I65.9.
5 Medicare
3 Aetna
CPT Codes Commonly Billed with I65.9
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 I65.9 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 |
|---|---|---|
| I65.9 | 43390 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I65.9
Other codes in section I60-I69 (Cerebrovascular diseases).
ICD-10 I65.9, Billing FAQ
Is ICD-10 code I65.9 billable? +
Yes, I65.9 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 I65.9? +
ICD-10 I65.9 includes: Occlusion and stenosis of precerebral artery NOS.
What ICD-9 codes does I65.9 map to? +
Per CMS GEMs, I65.9 maps to ICD-9 codes: 43390. 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 May 31, 2026.
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