ICD-10-CM 2027
ICD-10 code for Hemiparkinsonism
From the official ICD-10-CM alphabetic index entry “Hemiparkinsonism”. Page updated September 29, 2026.
About coding Hemiparkinsonism
The ICD-10-CM code for Hemiparkinsonism is G20.C (Parkinsonism, unspecified).
Within G20, choose G20.C (Parkinsonism, unspecified) only when documentation doesn't support a more specific option: without dyskinesia (G20.A) and with dyskinesia (G20.B).
Don't report G20.C together with the conditions in its Excludes1 note: Parkinson's disease NOS (G20.A1), Parkinson's disease with dyskinesia (G20.B-), Parkinson's disease without dyskinesia (G20.A-) and secondary parkinsonism (G21.-).
Use an additional code, if applicable, to identify: dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4), dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-), dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3), dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2), dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0) and 1 more.
Don't confuse with (Excludes1 for G20.C)
Common questions about Hemiparkinsonism ICD-10 codes
What is the ICD-10 code for Hemiparkinsonism?
- G20.C — Parkinsonism, unspecified.
Is G20.C billable?
- Yes. G20.C is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G20.C be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G20.C as a principal diagnosis.
Is G20.C a CC or MCC?
- No. G20.C is neither a CC nor an MCC under MS-DRG v44.0.