Friedreich and Other Hereditary Ataxias; Huntington Disease
Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 200 carries a community non-dual aged RAF of 0.279, and 17 payable ICD-10-CM diagnosis codes map to it.
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.
ICD-10-CM codes that map to HCC 200 (17)
Payable diagnosis codes that map to this category under CMS-HCC V28 PY2026. Open any code for its full description, HCC mapping, and coding guidance.
- G10Huntington's disease
- G11.0Congenital nonprogressive ataxia
- G11.10Early-onset cerebellar ataxia, unspecified
- G11.11Friedreich ataxia
- G11.19Other early-onset cerebellar ataxia
- G11.2Late-onset cerebellar ataxia
- G11.3Cerebellar ataxia with defective DNA repair
- G11.4Hereditary spastic paraplegia
- G11.5Hypomyelination - hypogonadotropic hypogonadism - hypodontia
- G11.6Leukodystrophy with vanishing white matter disease
- G11.8Other hereditary ataxias
- G11.9Hereditary ataxia, unspecified
- G31.80Leukodystrophy, unspecified
- G90.BLMNB1-related autosomal dominant leukodystrophy
- G93.42Megalencephalic leukoencephalopathy with subcortical cysts
- G93.43Leukoencephalopathy with calcifications and cysts
- G93.44Adult-onset leukodystrophy with axonal spheroids
Frequently asked questions
What is CMS-HCC V28 category 200?
HCC 200 is "Friedreich and Other Hereditary Ataxias; Huntington Disease", a payment Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 17 payable ICD-10-CM codes map to it.
What is the RAF weight for HCC 200?
The community non-dual aged relative factor for CMS-HCC V28 category 200 is 0.279. The exact factor varies by enrollment segment (community Medicaid and originally-disabled status, and institutional); the full segment table is published in the CMS V28 Rate Announcement.
How many ICD-10-CM codes map to HCC 200?
17 payable ICD-10-CM diagnosis codes map to CMS-HCC V28 category 200 (Friedreich and Other Hereditary Ataxias; Huntington Disease) for payment year 2026.
Source: CMS published ICD-10-CM mapping file plus CMS-HCC v28 PY2026 model software.