CPT® Code 80193

The CPT® Code 80193 refers to a laboratory test specifically designed to monitor therapeutic levels of leflunomide, which is classified as a disease-modifying antirheumatic drug (DMARD). This medication is primarily utilized in the treatment of moderate to severe rheumatoid arthritis in adult patients. Leflunomide functions by suppressing the immune system, thereby reducing joint damage and alleviating inflammation that leads to pain and swelling. It is important to note that leflunomide has been associated with significant risks, including the potential for birth defects in children of individuals—both men and women—who are undergoing treatment with this drug. Additionally, there is a risk of liver damage, necessitating regular monitoring through blood tests. These tests are typically conducted every 6 to 8 weeks to assess liver function and ensure that therapeutic levels of the drug are maintained. It is noteworthy that a substantial proportion of patients, up to 50%, may discontinue leflunomide treatment within the first year due to adverse drug reactions. The monitoring process involves assessing the levels of leflunomide or its active metabolite, A77 1726, in the patient's plasma, utilizing high-performance liquid chromatography. This testing is crucial for evaluating the relationship between drug levels and disease activity in the joints, ensuring that patients receive optimal therapeutic benefits while minimizing potential risks.