I72.9 ICD-10-CM Code: Aneurysm of unspecified site

Code

I72.9

Description

Aneurysm of unspecified site

HCC (V28)

No CMS-HCC V28 mapping

RAF reference coefficient

—

Billable

Yes

Payment year

2026

HCC Category Mapping

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work I72.9 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for I72.9

What This Code Means

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for I72.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

• •This is a non-specific code; attempt to obtain more information about the aneurysm location from the provider
• •Query the physician if the specific artery location can be determined from imaging or clinical documentation

Clinical Significance

Aneurysm of unspecified site represents an aneurysmal condition where the specific artery has not been documented. While this captures vascular disease for risk adjustment, it is a nonspecific code that should prompt a review of available imaging and clinical documentation to assign a more precise code. The presence of any aneurysm indicates underlying vascular pathology requiring management.

Documentation Requirements

• ✓Documentation confirming aneurysm diagnosis
• ✓Any available imaging reports to determine specific location
• ✓Query provider for specific artery involved
• ✓Assessment of aneurysm status (intact, symptomatic, or complicated)
• ✓Treatment and surveillance plan
• ✓Underlying etiology when known

Commonly Confused Codes

• •I72.0-I72.8: Specific artery aneurysm codes: always use the most specific code available
• •I71.x: Aortic aneurysm codes: aortic aneurysms have their own category and should not be coded as I72.9
• •I67.1: Cerebral aneurysm, nonruptured: intracranial aneurysms have their own specific codes
• •I77.0: Arteriovenous fistula, acquired: different vascular pathology

Child Codes