What does ICD-10-CM code I73.9 mean?
I73.9 represents Peripheral vascular disease, unspecified. This cardiovascular condition is classified under Chapter 9 (Diseases of the Circulatory System) and is one of the most commonly coded circulatory system diagnoses. This condition is commonly abbreviated as PAD, Peripheral arterial disease in clinical documentation. Coders frequently reference this code as peripheral artery disease icd 10 or peripheral artery disease.
Code category and hierarchy
- Chapter: 9 – Diseases of the Circulatory System (I00-I99)
- Category: I73
- Code: I73.9 – Peripheral vascular disease, unspecified
Guideline notes and coding considerations
Specificity Warning
I73.9 is an unspecified code. Query the provider for greater specificity when documentation suggests a more precise code is available. Using unspecified codes when specific codes exist may trigger audits.
- Excludes1: atherosclerosis of the extremities ( I70.2 --I70.7-); atherosclerosis of the extremities ( I70.2 --I70.7-)
Learn the underlying rules in the ICD-10 Coding Guidelines, Combination Code Requirements, Risk Adjustment & MEAT Documentation.
Documentation tips (what coders should confirm)
- Verify the clinical documentation supports the use of I73.9
- Query the provider for greater specificity if clinical details suggest a more precise code
- This is a risk-adjusted diagnosis — ensure annual documentation with MEAT criteria (Monitor, Evaluate, Assess/Address, Treat)
When NOT to use I73.9
Do not assign I73.9 when the clinical scenario involves: atherosclerosis of the extremities ( I70.2 --I70.7-); atherosclerosis of the extremities ( I70.2 --I70.7-); when documentation provides enough detail for a more specific code. Review excludes notes and assign the most specific code supported by documentation.
Audit risk
I73.9 is an unspecified code. Payers and auditors may flag claims with unspecified codes when the medical record contains sufficient detail for a more precise diagnosis. Query the provider for specificity before submitting.
Validate I73.9 Against ICD 10 CM Coding Guidelines
Check this code against official guidelines for conflicts and compliance issues.
Risk adjustment and HCC mapping
HCC Impact
I73.9 (Peripheral vascular disease, unspecified) maps to the following HCC categories: CMS-HCC V24: HCC 108, ESRD V24: HCC 108. Proper documentation using MEAT criteria (Monitor, Evaluate, Assess/Address, Treat) is required for each encounter to support risk-adjusted diagnoses.
Learn more about risk adjustment documentation in our Risk Adjustment & MEAT Documentation Guide.
Related ICD-10 codes
Frequently Asked Questions
The ICD-10-CM code for peripheral artery disease is I73.9, which represents peripheral vascular disease, unspecified. This code is also commonly referenced as peripheral artery disease. Verify this code using the ICD Code Auditor to ensure guideline compliance.
Yes. I73.9 is an active ICD-10-CM diagnosis code used to classify peripheral vascular disease, unspecified for clinical documentation, reporting, and medical billing purposes.
Use the ICD Code Auditor to check I73.9 against official ICD-10-CM coding guidelines. The tool validates by fiscal year and patient gender to identify potential conflicts.
I73.9 should be used only when clinical documentation does not provide enough detail for a more specific code. Always query the provider when documentation suggests greater specificity is available, as unspecified codes may trigger audits and impact risk adjustment.
Yes. I73.9 maps to HCC 108 in the CMS-HCC V24 model. Accurate coding of this condition directly impacts RAF scores for Medicare Advantage plans. Ensure documentation demonstrates the condition was evaluated and managed during the encounter.
Documentation should clearly describe the clinical condition represented by I73.9 (Peripheral vascular disease, unspecified). Include relevant clinical findings, diagnostic test results, provider assessment, and the treatment plan. The diagnosis must be supported by the medical record and not based solely on lab results without clinical interpretation.
Sources
Reviewed by: Certified ICD-10 Coding & Risk Adjustment Specialist
Learn more about our Clinical Coding Review Process