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ICD-10 Code G20.C: Parkinsonism, unspecified

G20.C is a billable ICD-10 diagnosis code used to classify Parkinsonism, unspecified in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

When is it used?

  • May be used when a clinician documents parkinsonism, unspecified in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
6Diseases of the nervous system (G00-G99)
block
G20-G26Extrapyramidal and movement disorders
category
G20Parkinson's disease
currentG20

Official coding notes

Inclusion terms
  • Parkinsonism, NOS
Excludes1 (do not code together)
  • Parkinson's disease NOS (G20.A1)
  • Parkinson's disease with dyskinesia (G20.B-)
  • Parkinson's disease without dyskinesia (G20.A-)
  • secondary parkinsonism (G21.-)

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

NeurologistGeneral Physician

Coding guidelines

Common synonyms

Parkinsonism, unspecifiedParkinsonism

Frequently asked questions

Code details

CodeG20.C
SystemICD10
Display nameParkinsonism, unspecified
ChapterDiseases of the nervous system (G00-G99)
BlockExtrapyramidal and movement disorders

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)HemiparkinsonismParalysis, paralytic(complete) (incomplete)Parkinsonism(idiopathic) (primary)Parkinsonism(idiopathic) (primary)Parkinsonism(idiopathic) (primary)Pyramidopallidonigral syndromeSyndrome
See also
Dementia, in, diseases specified elsewhereParkinsonism

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code G20.C for Parkinsonism, unspecified | HealthAssure