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G20 ⚠ Non-billable

Parkinson's disease

ICD-10-CM · FY2026 · Diseases of the Nervous System

Code
G20
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Nervous System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Also known as
  • 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-)

Frequently asked questions

What is ICD-10 code G20?
ICD-10-CM code G20 represents Parkinson's disease. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Nervous System chapter, effective October 1, 2025 – September 30, 2026.
Is G20 billable?
No. G20 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is G20 in?
G20 belongs to the Diseases of the Nervous System chapter (G00–G99) of ICD-10-CM.

Related codes in the G20 category

G20.A Parkinson's disease without dyskinesia Non-billable G20.B Parkinson's disease with dyskinesia Non-billable G20.C Parkinsonism, unspecified Billable G20.A1 Parkinson's disease without dyskinesia, without mention of fluctuations Billable G20.A2 Parkinson's disease without dyskinesia, with fluctuations Billable G20.B1 Parkinson's disease with dyskinesia, without mention of fluctuations Billable G20.B2 Parkinson's disease with dyskinesia, with fluctuations Billable

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