ICD-10-CM > G00-G99 > G20-G26 > G20 > G20.C G20.C Parkinsonism, unspecified Billable/Specific Copy Code Copy Description Applicable To Parkinsonism, NOS Type 1 Excludes Parkinson's disease NOS (G20.A1)Parkinson's disease with dyskinesia (G20.B-)Parkinson's disease without dyskinesia (G20.A-)secondary parkinsonism (G21.-)