Summary & Overview
CPT 78315: Three‑Phase Bone Scan (Scintigraphy)
CPT code 78315 represents a three‑phase bone scan (scintigraphy), a nuclear medicine procedure that uses an injected radionuclide and timed imaging sequences to evaluate bone perfusion and metabolic activity. This diagnostic test is important nationally for detecting fractures, osteomyelitis, metastatic disease, and other bone pathologies when radiographs are inconclusive. The code is widely used across hospital outpatient imaging centers and freestanding nuclear medicine or radiology clinics.
Key payers covered in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for when a three‑phase bone scan is performed, the typical service setting, and what the procedure evaluates. The publication provides benchmarks and reimbursement context, outlines common billing considerations, and summarizes relevant policy or coverage updates that commonly affect nuclear medicine imaging services.
The piece is intended to help revenue cycle professionals, imaging administrators, and policy analysts understand where 78315 fits into diagnostic imaging workflows and payer coverage landscapes, and to identify operational and policy levers that influence utilization and payment.
Billing Code Overview
CPT code 78315 describes a three‑phase bone scan (scintigraphy), a specialized nuclear medicine imaging procedure in which a radionuclide is injected prior to imaging to evaluate the bones of the skeleton and to diagnose bone disease. The procedure captures sequential images that assess blood flow, blood pool, and delayed bone uptake to identify infection, fracture, tumor, or metabolic bone disease.
Service Type: Nuclear medicine diagnostic imaging
Typical Site of Service: Hospital outpatient imaging center or freestanding nuclear medicine / radiology clinic
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Clinical & Coding Specifications
Clinical Context
A typical patient is a 62-year-old with persistent focal bone pain and a prior history of metastatic prostate cancer who is referred for a three-phase bone scan to evaluate for osteomyelitis versus soft-tissue inflammation and to assess for skeletal metastases. The patient arrives at the nuclear medicine department, a consent and brief clinical history are obtained, and intravenous access is established for injection of technetium-labeled radiotracer. The imaging workflow includes an initial dynamic flow (immediate postinjection) phase to assess perfusion, an early blood-pool (soft-tissue) phase obtained minutes after injection, and delayed whole-body or regional skeletal imaging performed 2–4 hours later to evaluate tracer uptake in bone. A nuclear medicine physician reviews images, interprets findings, and generates a report for the referring provider. Typical sites of service are hospital outpatient imaging centers, inpatient hospital radiology/nuclear medicine departments, and freestanding outpatient imaging centers. Staff include a nuclear medicine technologist to perform injections and acquisitions and a radiopharmacist or nuclear medicine physician overseeing tracer handling and imaging protocols.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting only the interpreting physician's professional component for the study performed by an independent facility or when billing is split between technical and professional components. |