G20.A2 – Parkinson's disease without dyskinesia, with fluctuations

ICD-10-CM 2027 diagnosis code · Extrapyramidal and movement disorders

Billable code

ICD-10-CM code G20.A2

Code: G20.A2 (claims format: G20A2)
Description: Parkinson's disease without dyskinesia, with fluctuations
Billable: Yes – valid for HIPAA-covered transactions
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 › G20.A

Notes for G20.A2

Applicable to:

Parkinson's disease without dyskinesia, with OFF episodes

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-)

Index terms for G20.A2

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in G20.A

G20.A1 – Parkinson's disease without dyskinesia, without mention of fluctuationsBillable

Frequently asked questions

What is ICD-10 code G20.A2?

G20.A2 is the ICD-10-CM code for parkinson's disease without dyskinesia, with fluctuations, in the block G20-G26 (Extrapyramidal and movement disorders).

Is G20.A2 a billable code?

Yes. G20.A2 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does G20.A2 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.