G21.8: Other secondary parkinsonism
G21.8 is the billable ICD-10-CM diagnosis code for Other secondary parkinsonism. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code G21.8?
G21.8 is the ICD-10-CM diagnosis code for Other secondary parkinsonism. It belongs to category G21 (Secondary parkinsonism).
Is G21.8 a billable code?
Yes. G21.8 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does G21.8 belong to?
G21.8 is part of ICD-10-CM category G21 — Secondary parkinsonism, which has 16 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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