G21Non-billable (header)
Secondary parkinsonism
Related Codes· Extrapyramidal and movement disorders (G20-G26)
Sub-codes of G21(7)
G21 is a non-billable header. Select a sub-code to bill.
G21.0Malignant neuroleptic syndrome✓ BillableG21.1Other drug-induced secondary parkinsonismHeaderG21.2Secondary parkinsonism due to other external agents✓ BillableG21.3Postencephalitic parkinsonism✓ BillableG21.4Vascular parkinsonism✓ BillableG21.8Other secondary parkinsonism✓ BillableG21.9Secondary parkinsonism, unspecified✓ Billable
✗ Excludes 1(Not coded here)
- •Huntington's disease (G10)
- •neurocognitive disorder with Lewy bodies (G31.83)
- •Shy-Drager syndrome (G90.3)
- •syphilitic Parkinsonism (A52.19)
Code Hierarchy
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