HCC 1: HIV/AIDS ICD-10-CM
CMS-HCC Category 1 (HIV/AIDS) is a payment HCC in the V28 Medicare Advantage risk adjustment model. For payment year 2026 it adds a risk adjustment factor between 0.109 and 1.322 to a beneficiary's RAF score depending on the payment segment (0.301 for a community, non-dual, aged enrollee). 3 ICD-10-CM diagnosis codes map to HCC 1. It sits at the top of its hierarchy: no other condition category supersedes it.
RAF Weight by Payment Segment 7 segments
| Payment Segment | Relative Factor |
|---|---|
| Community, non-dual, aged | 0.301 |
| Community, partial-benefit dual, aged | 0.196 |
| Community, full-benefit dual, aged | 0.397 |
| Community, non-dual, disabled | 0.213 |
| Community, partial-benefit dual, disabled | 0.109 |
| Community, full-benefit dual, disabled | 0.237 |
| Institutional | 1.322 |
A beneficiary is scored in exactly one segment, set by Medicaid (dual) status, aged or disabled entitlement, and residence. Factors are relative weights, not dollar amounts; new-enrollee segments score on demographics only. HCC 1 neither supersedes nor is superseded by any other category, so it always counts alongside unrelated HCCs.
ICD-10-CM Codes That Map to HCC 1 3 codes
- B20 Human immunodeficiency virus [HIV] disease
- B97.35 Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere
- Z21 Asymptomatic human immunodeficiency virus [HIV] infection status
Every code above carries the full HCC 1 weight when documented and reported on a Medicare Advantage encounter. The code link opens its full page with the complete risk adjustment card.
Questions About HCC 1
What is HCC 1 in the CMS-HCC model?
HCC 1 is CMS-HCC Category 1 (HIV/AIDS) in the V28 risk adjustment model. It covers 3 ICD-10-CM diagnosis codes that raise a Medicare Advantage beneficiary's risk score when documented.
What is the RAF weight for HCC 1?
For payment year 2026, HCC 1 adds 0.301 to the RAF score of a community, non-dual, aged beneficiary (living at home, age 65 or over, not also enrolled in Medicaid). The published weights range from 0.109 to 1.322 across the seven payment segments shown above.
Related References
Source: Centers for Medicare & Medicaid Services, Payment Year 2026 risk adjustment mapping and model software releases (CMS-HCC V28), applied to the FY 2026 ICD-10-CM code set. ICD List is not affiliated with CMS.
