Thyroxine Billing Restrictions

Effective for dates of service on or after September 1, 2009, the following restrictions apply when billing for laboratory tests related to the thyroid hormone, thyroxine:

• CPT-4 code 84436 (thyroxine; total) is not reimbursable if code 84439 (thyroxine, free) has previously been reimbursed for the same date of service, recipient and provider.
• CPT-4 code 84479 (thyroid hormone [T3 or T4] uptake or thyroid hormone binding ratio [THBR]) is not reimbursable if code 84439 has previously been reimbursed for the same date of service, recipient and provider.
• Reimbursement for CPT-4 code 84439 will be reduced if either code 84436 or 84479 has previously been reimbursed for the same date of service, recipient and provider.