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199 HCC

Parkinson and Other Degenerative Disease of Basal Ganglia

CMS Model V28 16 Associated ICD-10 Diagnoses

Relative Risk Score Factors (Coefficients for HCC 199)

Enrollment Model Type Coeff Tag Year Weight Score
CFA HCC199 2026 + 0.634
CFD HCC199 2026 + 0.504
CNA HCC199 2026 + 0.615
CND HCC199 2026 + 0.517
CPA HCC199 2026 + 0.474
CPD HCC199 2026 + 0.354
INS HCC199 2026 + 0.219

Mapped ICD-10-CM Diagnoses (16)

The following diagnoses map directly to HCC 199 under the V28 risk adjustment model:

ICD-10 Code Clinical Diagnosis Description Guideline
G20.A1 Parkinson's disease without dyskinesia, without mention of fluctuations Notes ↗
G20.A2 Parkinson's disease without dyskinesia, with fluctuations Notes ↗
G20.B1 Parkinson's disease with dyskinesia, without mention of fluctuations Notes ↗
G20.B2 Parkinson's disease with dyskinesia, with fluctuations Notes ↗
G20.C Parkinsonism, unspecified Notes ↗
G21.3 Postencephalitic parkinsonism Notes ↗
G21.4 Vascular parkinsonism Notes ↗
G21.8 Other secondary parkinsonism Notes ↗
G21.9 Secondary parkinsonism, unspecified Notes ↗
G23.0 Hallervorden-Spatz disease Notes ↗
G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski] Notes ↗
G23.2 Striatonigral degeneration Notes ↗
G23.3 Hypomyelination with atrophy of the basal ganglia and cerebellum Notes ↗
G23.8 Other specified degenerative diseases of basal ganglia Notes ↗
G23.9 Degenerative disease of basal ganglia, unspecified Notes ↗
G90.3 Multi-system degeneration of the autonomic nervous system Notes ↗
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