V28 HCC 229
Unstable Angina and Other Acute Ischemic Heart Disease
Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 229 has a source-labeled community non-dual aged reference coefficient of 0.24, and 25 ICD-10-CM diagnosis codes appear in its official mapping. In the V28 hierarchy it is superseded by HCC 228 when a more severe category in the same disease group is also present.
RAF factors
The community factor varies by Medicaid and originally-disabled status; the institutional factor applies to long-term-institutional members. These are the CMS-HCC V28 PY2026 relative factors.
These are source-labeled code-level HCC coefficient references, not a full member score. Use the RAF Calculator with complete member context for CMS-HCC V28 PY2026. No score is shown unless every required source and calculation check passes.
V28 hierarchy
Trumped by: HCC 228 (a more severe category in the same disease group supersedes this one).
ICD-10-CM codes that map to HCC 229 (25)
ICD-10-CM codes in the official mapping for this category under CMS-HCC V28 PY2026. Open any code for its full description and coding guidance.
- I20.0Unstable angina
- I23.0Hemopericardium as current complication following acute myocardial infarction
- I23.1Atrial septal defect as current complication following acute myocardial infarction
- I23.2Ventricular septal defect as current complication following acute myocardial infarction
- I23.3Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarction
- I23.4Rupture of chordae tendineae as current complication following acute myocardial infarction
- I23.5Rupture of papillary muscle as current complication following acute myocardial infarction
- I23.6Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
- I23.7Postinfarction angina
- I23.8Other current complications following acute myocardial infarction
- I24.0Acute coronary thrombosis not resulting in myocardial infarction
- I24.1Dressler's syndrome
- I24.81Acute coronary microvascular dysfunction
- I24.89Other forms of acute ischemic heart disease
- I24.9Acute ischemic heart disease, unspecified
- I25.110Atherosclerotic heart disease of native coronary artery with unstable angina pectoris
- I25.700Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris
- I25.710Atherosclerosis of autologous vein coronary artery bypass graft(s) with unstable angina pectoris
- I25.720Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris
- I25.730Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unstable angina pectoris
- I25.750Atherosclerosis of native coronary artery of transplanted heart with unstable angina
- I25.760Atherosclerosis of bypass graft of coronary artery of transplanted heart with unstable angina
- I25.790Atherosclerosis of other coronary artery bypass graft(s) with unstable angina pectoris
- I51.1Rupture of chordae tendineae, not elsewhere classified
- I51.2Rupture of papillary muscle, not elsewhere classified
Coder workflow notes
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Frequently asked questions
What is CMS-HCC V28 category 229?
HCC 229 is "Unstable Angina and Other Acute Ischemic Heart Disease", a Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 25 ICD-10-CM codes appear in its official mapping.
What reference coefficient is published for HCC 229?
The source-labeled community non-dual aged reference coefficient for CMS-HCC V28 category 229 is 0.24. The exact coefficient varies by enrollment segment (community Medicaid and originally-disabled status, and institutional); the full segment table is published in the CMS V28 model files.
How many ICD-10-CM codes map to HCC 229?
25 ICD-10-CM diagnosis codes appear in the official mapping for CMS-HCC V28 category 229 (Unstable Angina and Other Acute Ischemic Heart Disease) for payment year 2026.
Which categories trump HCC 229 in the V28 hierarchy?
HCC 229 is superseded by HCC 228 (Acute Myocardial Infarction). When a more severe category in the same disease group is documented, it is counted instead of HCC 229.
Related condition guides
In-depth HCC coding guides for conditions that map to category 229, with documentation tips, common mistakes, and the V24-to-V28 changes.
Related references
Sources
CMS ICD-10-CM order-file billability plus the published mapping and CMS-HCC V28 PY2026 model software. CMS-HCC V28 model published at CMS.gov Risk Adjustors; ICD-10-CM member codes from the CMS ICD-10-CM code set.
Verified current to CMS-HCC V28, payment year 2026 — last reviewed May 30, 2026.