CPT 84436: Thyroxine (T4) Measurement, Serum
Commercial payers pay $20 on average nationally for this procedure.
CPT code 84436 represents a laboratory assay that measures total thyroxine (T4) concentration in a blood/serum specimen; this is a clinical laboratory test used to evaluate thyroid function and is typically performed in a clinical laboratory or hospital laboratory using venous blood obtained by routine phlebotomy.
For related coverage guidance, see recent payer policy updates: Salivary Hormone Testing, Parathyroid Hormone, Phosphorus, Calcium, and Magnesium Testing, Bone Turnover Markers Testing.
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National Reimbursement Benchmarks
National commercial reimbursements for CPT 84436 cluster around BUCA’s average commercial rate of $19.70, with variation across major carriers. Blue Cross Blue Shield shows a high mean and median ($29.50 and $27.40) while Aetna, Cigna, and UnitedHealth Group sit substantially lower (means $6.50, $7.60, and $6.00 respectively). BUCA’s mean of $19.70 represents an intermediate commercial benchmark between the lower-paying national commercial carriers and the outlying higher Blue Cross Blue Shield rates.
Dispersion measured as P75 minus P25 highlights where rates are tightest or widest: Aetna’s interquartile range is $2.90 ($7.90 - $5.00), Cigna’s is $5.40 ($10.00 - $4.60), UnitedHealth Group’s is $3.90 ($6.90 - $3.00), Blue Cross Blue Shield’s is $14.20 ($36.70 - $22.50), and BUCA’s is $9.80 ($24.50 - $14.70). Blue Cross Blue Shield shows the widest IQR, Aetna the tightest.