Definition:
CPT® 84403 describes the laboratory test used to measure total thyroxine (T4) levels in the blood. This test helps assess thyroid function, diagnose thyroid disorders such as hypo- or hyperthyroidism, and monitor patients on thyroid therapy.
When to Use:
- For patients presenting with symptoms of thyroid dysfunction, including fatigue, weight changes, or temperature intolerance.
- To monitor treatment in patients receiving thyroid hormone replacement or antithyroid medications.
- As part of comprehensive thyroid panels for diagnostic or routine screening purposes.
Documentation Requirements:
To support billing for CPT® 84403, clinicians should document:
- Medical necessity, including clinical symptoms or ongoing therapy.
- Relevant patient history and prior thyroid function test results.
- Follow-up plans or treatment adjustments based on T4 results.
Key Notes:
- CPT® 84403 specifically measures total T4; other thyroid tests (TSH, free T4, T3) are billed separately.
- Proper documentation ensures payer compliance and supports accurate reimbursement.
How OptiMantra Supports 84403:
OptiMantra’s EMR and practice management platform allows providers to order T4 tests directly from the chart, track clinical indications, and automatically integrate results into patient records. This streamlines documentation, supports clinical decision-making, and ensures clean, compliant claims for faster reimbursement.
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