V28 HCC 238
Specified Heart Arrhythmias
Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 238 has a source-labeled community non-dual aged reference coefficient of 0.299, and 17 ICD-10-CM diagnosis codes appear in its official mapping.
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.
ICD-10-CM codes that map to HCC 238 (17)
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.
- I44.2Atrioventricular block, complete
- I47.0Re-entry ventricular arrhythmia
- I47.20Ventricular tachycardia, unspecified
- I47.21Torsades de pointes
- I47.29Other ventricular tachycardia
- I47.9Paroxysmal tachycardia, unspecified
- I48.0Paroxysmal atrial fibrillation
- I48.11Longstanding persistent atrial fibrillation
- I48.19Other persistent atrial fibrillation
- I48.20Chronic atrial fibrillation, unspecified
- I48.21Permanent atrial fibrillation
- I48.3Typical atrial flutter
- I48.4Atypical atrial flutter
- I48.91Unspecified atrial fibrillation
- I48.92Unspecified atrial flutter
- I49.2Junctional premature depolarization
- I49.5Sick sinus syndrome
Coder workflow notes
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Frequently asked questions
What is CMS-HCC V28 category 238?
HCC 238 is "Specified Heart Arrhythmias", a Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 17 ICD-10-CM codes appear in its official mapping.
What reference coefficient is published for HCC 238?
The source-labeled community non-dual aged reference coefficient for CMS-HCC V28 category 238 is 0.299. 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 238?
17 ICD-10-CM diagnosis codes appear in the official mapping for CMS-HCC V28 category 238 (Specified Heart Arrhythmias) for payment year 2026.
Related condition guides
In-depth HCC coding guides for conditions that map to category 238, 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.