October 1 update. Our PDGM and ICD-10 tools now use the FY2027 code set: 190 codes added, 30 deleted, and no existing code changed clinical group.

See what changed

ICD-10 · PDGM grouping

G20 Parkinson's disease

All 5 codes in the G20 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.

ICD-10-CM FY2027 · CMS grouper v07.2.26

Codes in family

5

Can lead a claim

5

Cannot lead a claim

0

What CMS assigns to G20

All 5 codes group to Neuro Rehabilitation. All 5 count toward the Spinal Muscular Atrophy, Systemic atrophy and Motor Neuron Disease comorbidity subgroup. Every code can lead a claim.

  • Spinal Muscular Atrophy, Systemic atrophy and Motor Neuron Disease: can award the low comorbidity tier as a secondary diagnosis.

Every code in G20

Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
G20.A Parkinson's disease without dyskinesia
G20.A1Parkinson's disease without dyskinesia, without mention of fluctuationsCMS: Parkinson's dis w/o dyskinesia, w/o mention of fluctuationsCan lead a claimBSpinal Muscular Atrophy, Systemic atrophy and Motor Neuron Disease
G20.A2Parkinson's disease without dyskinesia, with fluctuationsCan lead a claimBSpinal Muscular Atrophy, Systemic atrophy and Motor Neuron Disease
G20.B Parkinson's disease with dyskinesia
G20.B1Parkinson's disease with dyskinesia, without mention of fluctuationsCMS: Parkinson's dis with dyskinesia, w/o mention of fluctuationsCan lead a claimBSpinal Muscular Atrophy, Systemic atrophy and Motor Neuron Disease
G20.B2Parkinson's disease with dyskinesia, with fluctuationsCan lead a claimBSpinal Muscular Atrophy, Systemic atrophy and Motor Neuron Disease
G20.CParkinsonism, unspecifiedCan lead a claimBSpinal Muscular Atrophy, Systemic atrophy and Motor Neuron Disease

Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.

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