V24 HCC 78 (Archived Category) ICD-10-CM
HCC 78 is a payment category of the retired CMS-HCC V24 model, which last determined Medicare Advantage payment in 2025. The 20 ICD-10-CM codes below are its final mappings, kept for lookback analysis and RADV audit reference. Each code shows where it maps in the live V28 model; 3 of them no longer risk-adjust at all.
Archived Codes of V24 HCC 78 20 codes
- G10 Huntington's disease now HCC 200
- G20.A1 Parkinson's disease without dyskinesia, without mention of fluctuations now HCC 199
- G20.A2 Parkinson's disease without dyskinesia, with fluctuations now HCC 199
- G20.B1 Parkinson's disease with dyskinesia, without mention of fluctuations now HCC 199
- G20.B2 Parkinson's disease with dyskinesia, with fluctuations now HCC 199
- G20.C Parkinsonism, unspecified now HCC 199
- G21.11 Neuroleptic induced parkinsonism no V28 successor
- G21.19 Other drug induced secondary parkinsonism no V28 successor
- G21.2 Secondary parkinsonism due to other external agents no V28 successor
- G21.3 Postencephalitic parkinsonism now HCC 199
- G21.4 Vascular parkinsonism now HCC 199
- G21.8 Other secondary parkinsonism now HCC 199
- G21.9 Secondary parkinsonism, unspecified now HCC 199
- G23.0 Hallervorden-Spatz disease now HCC 199
- G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski] now HCC 199
- G23.2 Striatonigral degeneration now HCC 199
- G23.3 Hypomyelination with atrophy of the basal ganglia and cerebellum now HCC 199
- G23.8 Other specified degenerative diseases of basal ganglia now HCC 199
- G23.9 Degenerative disease of basal ganglia, unspecified now HCC 199
- G90.3 Multi-system degeneration of the autonomic nervous system now HCC 199
Questions About This Archived Category
Is V24 HCC 78 still paid?
No. The CMS-HCC V24 model last determined Medicare Advantage payment in 2025; from payment year 2026 the V28 model pays 100% of the risk score. This page exists for lookback analysis and RADV audit periods that predate the transition.
Where did these codes go in V28?
Each row above names the code's live V28 category, or marks it as having no V28 successor. The category-level picture, with destination counts for every V24 category, is on V24 to V28: What Changed.
Related References
Source: Centers for Medicare & Medicaid Services, Payment Year 2026 risk adjustment mapping and model software releases (CMS-HCC V28; CMS-HCC V24 from the last published V24 mappings, payment year 2025), applied to the FY 2026 ICD-10-CM code set. ICD List is not affiliated with CMS.
