Secondary parkinsonism

This code identifies parkinsonism that develops as a consequence of another underlying medical condition, medication, or toxin, rather than idiopathic Parkinson's disease. It encompasses a range of motor symptoms similar to Parkinson's disease, such as tremor, rigidity, bradykinesia, and postural instability, but with an identifiable secondary cause.

Apply this code when documentation clearly indicates parkinsonian symptoms are attributable to a specific exogenous factor (e.g., drug-induced, toxic exposure) or another neurological disorder (e.g., hydrocephalus, stroke, tumor). Supporting documentation should specify the secondary cause in addition to the parkinsonian symptoms.

• Always code the underlying cause of the secondary parkinsonism first, if known and applicable, followed by this code.
• Distinguish carefully from primary (idiopathic) Parkinson's disease (332.0) and other parkinsonian syndromes.
• Ensure the physician's documentation explicitly states "secondary parkinsonism" or clearly links the parkinsonian symptoms to a specific cause.