G21.11
Neuroleptic induced parkinsonism
Clinical Classification Guidelines
Use Additional Code
- code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
Excludes Type 1
- malignant neuroleptic syndrome (G21.0)
Medical Intelligence & Overview
Neuroleptic-induced Parkinsonism is a neurological condition that develops as a side effect of certain medications known as neuroleptics or antipsychotics. These medications are primarily used to treat mental health conditions like schizophrenia and bipolar disorder. While effective for managing psychiatric symptoms, they can sometimes cause Parkinson-like symptoms, which is referred to as neuroleptic-induced Parkinsonism.
Causes & Symptoms
Clinical Causes: Use of neuroleptic medications such as haloperidol, chlorpromazine, risperidone, or olanzapine. Long-term or high-dose treatment with antipsychotic drugs. Sensitivity to neuroleptic drugs in some individuals. Concomitant use of other medications that may enhance neuroleptic side effects.
Key Symptoms: Shaking or tremors, especially in hands or fingers. Muscle rigidity or stiffness. Slowness of movement (bradykinesia). Postural instability or balance problems. Masked facial expression or reduced facial movements. Drooling or difficulty swallowing. Shuffling gait or reduced arm swing during walking.
Diagnostic & Treatment
Diagnosis Path: Diagnosis typically involves a thorough clinical evaluation by a healthcare professional, including a detailed medication history and assessment of neurological symptoms. Physicians may perform physical examinations and use specific scales to evaluate Parkinsonism features. In some cases, neuroimaging studies may be conducted to rule out other causes of Parkinsonian symptoms. It is essential to differentiate neuroleptic-induced Parkinsonism from idiopathic Parkinson’s disease, as the management strategies differ.
Treatment Protocols: Reducing the dose of the neuroleptic medication if possible. Switching to antipsychotic drugs with fewer Parkinsonian side effects. Administering medications that help alleviate Parkinsonism symptoms, such as anticholinergic drugs (e.g., benztropine or trihexyphenidyl). Using amantadine, which may improve motor symptoms. Monitoring and reassessing medication periodically to minimize side effects.
Clinical Advice & FAQs
Billing Guidance
Is G21.11 a billable ICD-10 code?
Yes, G21.11 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report G21.11?
Clinical documentation must specify the nature of Neuroleptic induced parkinsonism and any associated comorbidities for accurate reporting.
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