What is billing code 84443?

Billing code 84443 refers to a laboratory test for measuring the level of thyroid-stimulating hormone (TSH) in the blood. This test is commonly used to assess thyroid function and diagnose conditions such as hypothyroidism or hyperthyroidism. It is part of a broader panel of thyroid function tests that may include measurements of free thyroxine (T4) and triiodothyronine (T3).