AMA CPT® Assistant - 2021 Issue 1 (January)
Therapeutic Drug Assays: 2021 Updates (January 2021)
January 2021 pages 8-9 Therapeutic Drug Assays: 2021 Updates For the Current Procedural Terminology (CPT®) 2021 code set, 10 new codes have been established in the Therapeutic Drug Assays subsection in the Pathology and Laboratory section to report therapeutic drug assays (TDA), which are tests performed to monitor levels of prescription or over-the-counter medications. To conduct a TDA, whole blood, serum, plasma, or cerebrospinal fluid is examined using quantitative testing to determine therapeutic or toxicology levels, which may be used to guide treatment. This article does not apply to urinary detection of qualitative or quantitative (definitive) assays for...
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