G21.1
Non-billableOther drug-induced secondary parkinsonism
G21.1 is the ICD-10-CM code for Other drug-induced secondary parkinsonism. It is a non-billable category code — use a more specific child code such as G21.11 for billing.
G00-G99 Diseases of the nervous system
What this means — in plain language
MedlinePlus · NIHMost of the time, medicines make our lives better. They reduce aches and pains, fight infections, and control problems such as high blood pressure or diabetes. But medicines can also cause unwanted reactions, such as drug interactions, side effects, and allergies. What is a drug interaction? A drug interaction is a change in the way a drug acts in the body when taken with certain other drugs, foods, or supplements…
Read more about Drug Reactions at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Medications indicated for this condition
FDA labeling- AmantadineInfluenza A M2 Protein Inhibitor [EPC]›
- Carbidopa and LevodopaAromatic Amino Acid [EPC]›
- CarbidopaAromatic Amino Acid Decarboxylation Inhibitor [EPC]›
Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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