2024 ICD-10-CM Diagnosis Code G20.A1

Parkinson’s disease without dyskinesia, without mention of fluctuations

• G20.A1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Parkinson’s dis w/o dyskinesia, w/o mention of fluctuations
• ICD-10-CM G20.A1 is a new 2024 ICD-10-CM code that became effective on October 1, 2023.
• This is the American ICD-10-CM version of G20.A1 – other international versions of ICD-10 G20.A1 may differ.

Applicable To

• Parkinson’s disease NOS
• Parkinson’s disease without dyskinesia, without mention of OFF episodes

The following code(s) above G20.A1 contain annotation back-references

 that may be applicable to G20.A1:

• G00-G99  Diseases of the nervous system
• G20  Parkinson’s disease

ICD-10-CM G20.A1 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 056 Degenerative nervous system disorders with mcc
• 057 Degenerative nervous system disorders without mcc

Code History

• 2024 (effective 10/1/2023): New code

Code annotations containing back-references to G20.A1:

• Type 1 Excludes: G20.C

Diagnosis Index entries containing back-references to G20.A1:

• Dementia (degenerative (primary)) (old age) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) F03.90
  • with
    • Parkinson’s disease G20.A1 – see also Dementia, in, diseases specified elsewhere
      • with behavioral disturbance G20.A1 – see also Dementia, in, diseases specified elsewhere
  • in (due to)
    • Parkinson’s disease G20.A1 – see also Dementia, in, diseases specified elsewhere
• Disease, diseased – see also Syndrome
  • Parkinson’s G20.A1
    • without dyskinesia
      • without mention of
        • fluctuations G20.A1
        • OFF episodes G20.A1