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G21

Secondary parkinsonism

Non-billableCategory

Chapter: 6. Diseases of the nervous system

Section: G20-G26 - Extrapyramidal and movement disorders

Coding Guidelines

Excludes1 (Mutually Exclusive)

These codes should never be used together with G21

  • G10 - Huntington's disease (G10)
  • G31.83 - neurocognitive disorder with Lewy bodies (G31.83)
  • G90.3 - Shy-Drager syndrome (G90.3)
  • A52.19 - syphilitic Parkinsonism (A52.19)

Specific Codes (7)

G21.0Billable

Malignant neuroleptic syndrome

G21.1Category

Other drug-induced secondary parkinsonism

G21.2Billable

Secondary parkinsonism due to other external agents

G21.3Billable

Postencephalitic parkinsonism

G21.4Billable

Vascular parkinsonism

G21.8Billable

Other secondary parkinsonism

G21.9Billable

Secondary parkinsonism, unspecified

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