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G20 ICD-10-CM Code: Parkinson's disease

G20 isn’t billable on its own. Choose one of the 5 billable codes beneath it, the one the documentation supports.

Official description

G20

Parkinson's disease

ICD-10-CM diagnosis code · United States clinical modification

Billable codes under G20

G20 can’t be reported on its own. Choose the code below that matches what the note documents.

Where G20 sits

  1. 1

    Chapter 6

    Diseases of the nervous system (G00-G99)

  2. 2

    Section

    Extrapyramidal and movement disorders (G20-G26)

  3. 3

    Category G20

    Parkinson's disease

  4. 4

    Code G20

    Parkinson's disease

Notes for this code

Inclusion terms

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

Code first

No “code first” instruction is listed for G20.

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-)

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for G20.

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for G20.

Source and release

Data release
U.S. ICD-10-CM · FY 2027
Effective date
Oct 1, 2026

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Frequently asked questions

What does ICD-10-CM code G20 mean?

G20 is the FY 2027 U.S. ICD-10-CM code for “Parkinson's disease.”

Is G20 a billable or specific ICD-10-CM code?

No. G20 has 5 billable codes beneath it in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is G20 located in ICD-10-CM?

G20 is listed in Chapter 6, Diseases of the nervous system (G00-G99), within Extrapyramidal and movement disorders (G20-G26) (G20–G26), under category G20, Parkinson's disease.

What coding notes are listed for G20?

Its listed inclusion terms are Hemiparkinsonism; Idiopathic Parkinsonism or Parkinson's disease; Paralysis agitans; Primary Parkinsonism or Parkinson's disease. No code-first instruction is listed. Additional-code instructions: 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-). No Excludes1 note is listed. No Excludes2 note is listed.