T3, Total (Triiodothyronine) (CPT 84480)
Medicare Rate vs. Lab Charges
Medicare pays $11.27 for this test. Labs commonly charge $45.00–$165.00. That's a 299%–1364% markup above what Medicare pays.
What This Test Is
T3 is a thyroid hormone. Total T3 measures both bound and free T3. It's ordered to further evaluate thyroid function when TSH is abnormal or to diagnose thyroid disease. T3 is less commonly ordered than TSH but important in certain cases.
Medicare Rate vs. Lab Charges
| Medicare Allowable Rate | $11.27 |
| Typical Lab Charge Range | $45.00–$165.00 |
| Average Markup Above Medicare | 299%–1364% |
Does Medicare Cover This Test?
Yes, Medicare Part B covers T3 testing when ordered by a physician to evaluate abnormal TSH or suspected thyroid disease.
Common Reasons for Denial
- Ordered without abnormal TSH or thyroid symptoms
- Routine screening in asymptomatic patients
- Tested too frequently without medication changes
- TSH already normal—T3 testing may not be necessary
- No clinical indication documented
What To Do If You're Overcharged
If you received a lab bill that seems unusually high compared to Medicare rates:
- Check your Explanation of Benefits (EOB) from Medicare or your insurance to see what should have been paid.
- Request an itemized bill from the lab showing all charges.
- Compare to GougeStop rates for your area to see if the charge is reasonable.
- Contact the lab's billing department to dispute erroneous charges or negotiate a lower rate.
- File an appeal with Medicare if a claim was incorrectly denied.
Frequently Asked Questions
A: Both are thyroid hormones. T4 is less active; T3 is more biologically active. Both are measured to fully evaluate thyroid function.
A: Usually only if TSH is abnormal or symptoms persist despite normal TSH. T3 helps confirm hyperthyroidism or clarify confusing test results.
A: No. Total T3 includes T3 bound to proteins; Free T3 is the biologically active form. Free T3 is more accurate but costs more.