G20.BParkinson's disease with dyskinesia

G20.B is the ICD-10-CM diagnosis code for Parkinson's disease with dyskinesia. It belongs to category G20 (Parkinson's disease), block G20-G26 (extrapyramidal and movement disorders) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within G20 (Parkinson's disease), G20.B is specifically for Parkinson's disease with dyskinesia. Related codes cover without dyskinesia (G20.A) and parkinsonism, unspecified (G20.C).

To report this condition, pick the subcode that matches the documentation: G20.B1 (without mention of fluctuations) and G20.B2 (with fluctuations).

Don't report G20.B together with the conditions in its Excludes1 note: drug induced dystonia (G24.0-).

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.

It was added in FY2024, effective October 1, 2023.