CPT® Code 80199

The CPT® Code 80199 refers to a laboratory test specifically designed to measure the levels of tiagabine in the blood. Tiagabine, marketed under the brand name Gabitril, is classified as an anticonvulsant medication primarily utilized as an adjunctive treatment for individuals over the age of 12 who are experiencing partial seizure disorders. This medication plays a crucial role in managing seizures by modulating neurotransmitter activity in the brain. In addition to its primary use, tiagabine may also be prescribed off-label for various conditions, including anxiety disorders and neuropathic pain, highlighting its versatility in treating different neurological and psychological issues. To ensure effective therapeutic outcomes, it is essential to monitor tiagabine levels in patients. This monitoring is typically conducted through pre-dose (trough) blood draws, which are performed to assess the lowest concentration of the drug in the bloodstream before the next dose is administered. The blood sample required for this test is obtained through a venipuncture, a procedure that involves puncturing a vein to collect blood. The analysis of the blood sample is carried out using advanced techniques such as high-performance liquid chromatography coupled with tandem mass spectrometry, which allows for precise measurement of tiagabine concentrations in serum and/or plasma. This testing is vital for ensuring that patients maintain therapeutic levels of the medication, thereby optimizing treatment efficacy and minimizing potential side effects.