G20.A – Parkinson's disease without dyskinesia
ICD-10-CM 2027 diagnosis code · Extrapyramidal and movement disorders
ICD-10-CM code
G20.A
- Code
G20.A(claims format:G20A)- Description
- Parkinson's disease without dyskinesia
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G20-G26 Extrapyramidal and movement disorders
- Parent codes
- G20
Billable codes under G20.A
G20.A is a header code and cannot be used on claims. Choose the most specific code:
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G20 – Parkinson's disease
Applicable to:
- Hemiparkinsonism
- Idiopathic Parkinsonism or Parkinson's disease
- Paralysis agitans
- Primary Parkinsonism or Parkinson's disease
Use additional code:
- 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)
- mild neurocognitive disorder due to known physiological condition (F06.7-)
Related codes in G20
Frequently asked questions
What is ICD-10 code G20.A?
G20.A is the ICD-10-CM code for parkinson's disease without dyskinesia, in the block G20-G26 (Extrapyramidal and movement disorders).
Is G20.A a billable code?
No. G20.A is a header code with more specific child codes; report one of the billable codes listed above.
What category does G20.A belong to?
It belongs to category G20 – Parkinson's disease.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.