Medical code 84439 refers to a specific laboratory test used to measure the levels of thyroid-stimulating hormone (TSH) in the blood. This test is typically ordered to evaluate thyroid function and diagnose conditions such as hypothyroidism or hyperthyroidism. It is part of a broader set of tests that may include thyroid hormones like T3 and T4. Accurate coding is essential for proper billing and insurance reimbursement for these diagnostic services.
CPT codes 84439 (Thyroid stimulating hormone) and 84443 (Thyroxine, total) can be billed together if both tests are medically necessary and ordered for the same patient encounter. However, it’s important to check for any specific payer guidelines or bundling edits that may apply, as some insurance companies may have restrictions on billing these codes together. Always ensure that appropriate documentation supports the medical necessity for both tests.
Cpt 84439 tests the amount of free thyroxine in your body chemistry. This test may be ordered as a FT4, free T4, FTI or FT4 index. The specimen is serum, requiring special handling. Methods may include radioimmunoassay and equilibrium dialysis for reference method. Free thyroxine is a minimal amount of the total T4 level (approximately 1%). This test is not influenced by thyroid-binding abnormalities and perhaps correlates more closely with the true hormonal status. It may be effective in the diagnosis of hyperthyroidism and hypothyroidism.
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