Summary & Overview
CPT 78020: Thyroid Scan, Nuclear Medicine
CPT code 78020 denotes a thyroid scan, a nuclear medicine imaging study that uses a radionuclide tracer to assess thyroid gland function, identify nodules, and, when indicated, evaluate for metastatic disease in patients with thyroid cancer. Nationally, this exam is an important tool in endocrine and oncology diagnostic pathways, informing decisions about further imaging, biopsy, and therapeutic planning.
Key payers included in the coverage and benchmarking discussion are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical indications and expected sites of service, typical payer considerations, common billing modifiers, and related coding context where available. The publication also summarizes benchmarking and policy-relevant topics such as utilization patterns, prior authorization practices, and coding compliance considerations tied to nuclear medicine thyroid imaging.
This summary provides clinicians, coders, and policy analysts with a concise reference to the clinical purpose of CPT code 78020, the typical delivery settings, and the payer landscape impacting access and reimbursement. Data not available in the input is identified where applicable.
Billing Code Overview
CPT code 78020 describes a thyroid scan, a nuclear medicine diagnostic procedure that uses a radionuclide tracer to evaluate thyroid gland function and to detect thyroid nodules. The scan can also be performed as a whole-body thyroid scan for surveillance in patients with a history of thyroid cancer to assess for metastatic spread.
Service type: Nuclear medicine diagnostic imaging
Typical site of service: Hospital outpatient imaging departments, freestanding nuclear medicine or radiology centers, and outpatient clinics with nuclear medicine capability
Data not available in the input for payers, associated taxonomies, ICD-10 diagnoses, related codes, and service line.
Clinical & Coding Specifications
Clinical Context
A 52-year-old patient with a history of differentiated thyroid cancer after total thyroidectomy presents for surveillance. The patient is referred by an endocrinologist for a nuclear medicine thyroid scan using a radionuclide tracer to evaluate residual thyroid tissue and to detect metastatic uptake in the neck or distant sites. The clinical workflow begins with referral and prior authorization if required by the payer, scheduling with fasting or medication-holding instructions as appropriate, and obtaining informed consent. On the day of service, a nuclear medicine technologist administers the radiotracer (commonly 123I or 99mTc-pertechnetate), and images are acquired with a gamma camera; imaging may include dedicated thyroid views or a whole-body scan if indicated. The interpreting nuclear medicine physician or radiologist documents the technique, radiopharmaceutical and dose, imaging times, findings regarding gland uptake or focal nodules, and comparison to prior studies; a report is routed to the referring endocrinologist or surgeon for clinical management decisions.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician interpretation/report for the thyroid scan separate from technical services |
TC |