CPT® Code 83858

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The CPT® Code 83858 refers to a laboratory test specifically designed to measure the levels of methsuximide in the blood. Methsuximide, which is marketed under the brand name Celontin, is classified as a succinimide anticonvulsant medication. It is primarily utilized in the management of absence seizure disorders, which are characterized by brief episodes of impaired consciousness. The measurement of methsuximide levels is crucial for monitoring therapeutic drug levels in patients undergoing treatment, ensuring that the medication is effective while minimizing the risk of toxicity. The test involves obtaining a blood sample through a procedure known as venipuncture, which is a separate reportable service. The analysis of the serum or plasma is conducted using quantitative gas chromatography, a precise method that allows for the accurate quantification of the drug concentration in the blood. This testing is essential for healthcare providers to make informed decisions regarding dosage adjustments and overall treatment efficacy for patients with seizure disorders.