CPT code 78800 represents a planar nuclear medicine study using a gamma–emitting radiotracer to diagnose and localize a tumor, inflammatory process, or radiopharmaceutical distribution in a single body area. The code covers single–day, two–dimensional imaging of regions such as the head, neck, chest, or pelvis and may include vascular flow and blood pool imaging when cardiac pumping assessment is performed. As a foundational nuclear medicine service, it supports disease localization, staging, and management decisions across oncology, infection imaging, and cardiology.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical and service context for CPT code 78800, typical sites of service, and how the procedure is used in diagnostic workflows. The publication also summarizes common billing considerations, frequently used modifiers (provided in the input), and placement among related imaging services. Where specific data elements are not provided, the text notes that those items are not available in the input.

This national overview is intended for revenue cycle, coding, and clinical staff who need clear, concise guidance on the clinical role and billing identity of CPT code 78800, and what to expect when this planar nuclear medicine study is ordered or billed.