G21Secondary parkinsonism
ICD-10-CM category (non-billable header) code — part of Extrapyramidal and movement disorders (G20-G26)
Coding Notes
Excludes1 (never code both together)
- Huntington's disease (G10)
- neurocognitive disorder with Lewy bodies (G31.83)
- Shy-Drager syndrome (G90.3)
- syphilitic Parkinsonism (A52.19)
Subcategories (7)
- G21.0 Malignant neuroleptic syndrome
- G21.1 Other drug-induced secondary parkinsonism
- G21.2 Secondary parkinsonism due to other external agents
- G21.3 Postencephalitic parkinsonism
- G21.4 Vascular parkinsonism
- G21.8 Other secondary parkinsonism
- G21.9 Secondary parkinsonism, unspecified