T3 testing

The NCD for Thyroid testing only covers T-uptake. Can anyone give me some guidance on what ICD9 codes would cover TT3 and Free T3, and when these tests should be ordered.

to be safe

use the same NCD- they are all thyroid tests and if there is an NCD for T3, it would encompass the same codes. As to when it is ordered, that is a nuance best reserved for the ordering doctor. But it is another measure of the level of the hormone in the blood and tissues. Sometimes the TSH can be abnormal but the T3 and T4 normal, or vice versa, or any combination thereof (ok, I don't really understand it completely either)