U.S. ICD-10-CM · FY 2027

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

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

G20

Parkinson's disease

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

Classification

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

More specific choices

Codes under G20

G20 is a non-billable category. Choose the child code that best matches the documented diagnosis.

G20.A

Parkinson's disease without dyskinesia

G20.B

Parkinson's disease with dyskinesia

G20.C

Parkinsonism, unspecified

Documentation details

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.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

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

Code-specific guidance

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 more specific child codes 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.

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