1. ICD-10-CM Codes
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2. G00-G99
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3. G20-G26
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4. G21-
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5. 2023 ICD-10-CM Diagnosis Code G21.4

2023 ICD-10-CM Diagnosis Code G21.4

Vascular parkinsonism

2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

• G21.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2023 edition of ICD-10-CM G21.4 became effective on October 1, 2022.
• This is the American ICD-10-CM version of G21.4 - other international versions of ICD-10 G21.4 may differ.

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

Convert G21.4 to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change

• Paralysis, paralytic (complete) (incomplete) G83.9
  ICD-10-CM Diagnosis Code G83.9

  Paralytic syndrome, unspecified

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • agitans G20
    - see also Parkinsonism
    ICD-10-CM Diagnosis Code G20

    Parkinson's disease

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Hemiparkinsonism
    • Idiopathic Parkinsonism or Parkinson's disease
    • Paralysis agitans
    • Parkinsonism or Parkinson's disease NOS
    • Primary Parkinsonism or Parkinson's disease

    Use Additional

    • 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-)
    • arteriosclerotic G21.4
• Parkinsonism (idiopathic) (primary) G20
  ICD-10-CM Diagnosis Code G20

  Parkinson's disease

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

  Applicable To

  • Hemiparkinsonism
  • Idiopathic Parkinsonism or Parkinson's disease
  • Paralysis agitans
  • Parkinsonism or Parkinson's disease NOS
  • Primary Parkinsonism or Parkinson's disease

  Use Additional

  • 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-)
  • secondary G21.9
    ICD-10-CM Diagnosis Code G21.9

    Secondary parkinsonism, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    • due to
      • arteriosclerosis G21.4
  • arteriosclerotic G21.4
  • vascular G21.4

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.