I20.9 ICD-10-CM Code: Angina pectoris, unspecified

Code

I20.9

Description

Angina pectoris, unspecified

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 I20.9 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for I20.9

What This Code Means

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for I20.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

• •This is a default code used only when the type of angina cannot be specified from the medical record
• •Query the provider for more specific angina classification (stable, unstable, vasospastic) to improve coding specificity

Clinical Significance

Unspecified angina pectoris is a catch-all code that signals incomplete documentation of ischemic chest pain. While it still captures the presence of ischemic heart disease for risk adjustment under V24, it represents a missed opportunity for specificity. Providers should be queried to determine whether the angina is stable, unstable, vasospastic, or refractory.

Documentation Requirements

• ✓Provider statement confirming angina pectoris diagnosis
• ✓Clinical description of chest pain characteristics
• ✓Evidence that more specific angina classification cannot be determined from available documentation
• ✓Diagnostic workup results including electrocardiogram or stress test findings
• ✓Current cardiac medications

Commonly Confused Codes

• •I20.0: Unstable angina: a more specific and higher-acuity diagnosis that maps to HCC 87
• •I20.1: Angina pectoris with documented spasm: requires evidence of coronary spasm
• •I20.89: Other forms of angina pectoris: used when a specific angina type is identified but does not fit standard categories
• •R07.9: Chest pain, unspecified: not appropriate when angina is the established diagnosis
• •I25.119: Atherosclerotic heart disease of native coronary artery with unspecified angina: use when coronary artery disease coexists

Child Codes