ICD-10 I73.9
Billable / Specific HCC v28: 108Peripheral vascular disease, unspecified
About ICD-10-CM I73.9
ICD-10-CM code I73.9 represents Peripheral vascular disease, unspecified. This is a billable/specific code in the Circulatory System chapter (block I73). The 2026 edition of ICD-10-CM I73.9 became effective on October 1, 2025.
Coding Tips for I73.9
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
I73.9 is a CMS-HCC v28 risk-adjustment code (category 108). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under I73.9. Per CMS ICD-10-CM Tabular 2026.
- Intermittent claudication
- Peripheral angiopathy NOS
- Spasm of artery
Type 1 Excludes
Pure excludes, these codes can never be coded together with I73.9. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- atherosclerosis of the extremities (I70.2--I70.7-)
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for I73.9
Local Coverage Determinations (LCDs) from CMS MACs that list I73.9 as a covered diagnosis.
Showing top 10 of 361 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I73.9.
1 Aetna
1 Cigna
5 Medicare
CPT Codes Commonly Billed with I73.9
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 I73.9 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 |
|---|---|---|
| I73.9 | 4439 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I73.9
Other codes in section I70-I79 (Diseases of arteries, arterioles and capillaries).
ICD-10 I73.9, Billing FAQ
Is ICD-10 code I73.9 billable? +
Yes, I73.9 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 I73.9? +
ICD-10 I73.9 includes: Intermittent claudication; Peripheral angiopathy NOS; Spasm of artery.
What codes are Type 1 Excludes for I73.9? +
Type 1 Excludes (never code together with I73.9): atherosclerosis of the extremities (I70.2--I70.7-)
Does I73.9 affect Medicare Advantage HCC risk adjustment? +
Yes. I73.9 maps to CMS-HCC v28 category 108. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What ICD-9 codes does I73.9 map to? +
Per CMS GEMs, I73.9 maps to ICD-9 codes: 4439. 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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