2024 ICD-10-CM Diagnosis Code G20.C

Parkinsonism, unspecified

• G20.C is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• ICD-10-CM G20.C 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.C – other international versions of ICD-10 G20.C may differ.

Applicable To

• Parkinsonism, NOS

Type 1 Excludes

• Parkinson’s disease NOS (G20.A1)
• Parkinson’s disease with dyskinesia (G20.B-)
• Parkinson’s disease without dyskinesia (G20.A-)
• secondary parkinsonism (G21-)

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

 that may be applicable to G20.C:

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

ICD-10-CM G20.C 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

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

• Dementia (degenerative (primary)) (old age) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) F03.90
  • with
    • Parkinsonism G20.C – see also Dementia, in, diseases specified elsewhere
      • with behavioral disturbance G20.C – see also Dementia, in, diseases specified elsewhere
  • in (due to)
    • paralysis agitans G20.C – see also Dementia, in, diseases specified elsewhere
      • with behavioral disturbance G20.C – see also Dementia, in, diseases specified elsewhere
• Hemiparkinsonism G20.C
• Paralysis, paralytic (complete) (incomplete) G83.9
  • agitans G20.C – see also Parkinsonism
• Parkinsonism (idiopathic) (primary) G20.C
  • dementia G20.C – see also Dementia, in, diseases specified elsewhere
    • with behavioral disturbance G20.C – see also Dementia, in, diseases specified elsewhere
• Pyramidopallidonigral syndrome G20.C
• Syndrome – see also Disease
  • pyramidopallidonigral G20.C

Reimbursement claims with a date of serv