Summary & Overview
CPT 78013: Thyroid Radioiodine Uptake and Imaging
CPT code 78013 denotes a nuclear medicine thyroid uptake and imaging study performed after administration of radioiodine to determine how much radioiodine concentrates in the thyroid. This diagnostic test is clinically important for evaluating thyroid nodules, inflammation, structural abnormalities, and the causes of hyperthyroidism. Nationally, thyroid imaging with radioiodine remains a key tool in endocrinology and nuclear medicine pathways for thyroid disease assessment.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for the procedure, typical sites of service, common billing modifiers, and a synopsis of payer coverage patterns where available. The publication summarizes benchmarks and reimbursement context, highlights relevant policy considerations that affect access and billing, and provides practical coding references for revenue-cycle and clinical teams.
The piece is intended for a national audience of clinicians, coding professionals, and policy analysts who need a concise reference on clinical utility, billing context, and payer considerations for CPT code 78013.
Billing Code Overview
CPT code 78013 describes imaging of the thyroid gland after administration of radioiodine to measure the amount of radioiodine that reaches the thyroid. The procedure evaluates thyroid size, structure, and function and helps investigate lumps, inflammation, causes of hyperthyroidism, or anatomical abnormalities.
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Service type: Nuclear medicine diagnostic imaging of the thyroid using radioiodine uptake and imaging
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Typical site of service: Outpatient imaging center, hospital nuclear medicine department, or radiology clinic
Clinical & Coding Specifications
Clinical Context
A 52-year-old woman presents with a palpable thyroid nodule and symptoms of palpitations and weight loss. Her primary care physician documents abnormal thyroid function tests with elevated free thyroxine and suppressed TSH and refers her for thyroid scintigraphy to evaluate uptake patterns and determine whether the nodule is functioning (hot) or nonfunctioning (cold). At the nuclear medicine appointment the patient receives a measured oral dose of radioiodine (usually I-123 or I-131 depending on local protocol). After an appropriate uptake interval the nuclear medicine technologist and interpreting physician perform thyroid imaging to quantify radioiodine uptake and visualize gland morphology and focal uptake. The clinical workflow includes: patient check-in and medication reconciliation (review of iodine-containing contrast, recent antithyroid drugs), administration of the radiopharmaceutical with dose documentation, timed uptake measurement, planar and/or SPECT imaging of the thyroid, image processing, interpretation and reporting by a board‑certified nuclear medicine physician or radiologist, and documentation of findings in the electronic medical record with correlation to laboratory and ultrasound data. Typical sites of service are an outpatient nuclear medicine department, ambulatory imaging center, or hospital radiology department.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician interpretation/report for the study separate from technical components |