CPT® Code 80203

The CPT® Code 80203 refers to a laboratory test specifically designed to measure the levels of zonisamide in the blood. Zonisamide is a medication classified as a sulfonamide anticonvulsant, primarily utilized as an adjunctive treatment for adults experiencing partial-onset seizures. This means that it is often prescribed in conjunction with other medications to enhance seizure control. In addition to its primary use, zonisamide may also be prescribed off-label for various conditions, including migraine headaches, neuropathic pain, and bipolar disorder, indicating its versatility in treating different neurological and psychiatric disorders. Furthermore, zonisamide is currently undergoing clinical trials for potential applications in treating Parkinson's disease, marketed under the trade name Tremode, and for obesity, under the trade name Empatic. To ensure therapeutic efficacy and safety, monitoring of zonisamide levels is crucial, which is typically conducted through pre-dose (trough) blood draws. The blood sample required for this test is obtained via venipuncture, a procedure that is separately reportable. The analysis of the serum and/or plasma is performed using a quantitative enzyme multiplied immunoassay technique, which allows for precise measurement of the drug concentration in the bloodstream.