Summary & Overview
CPT 78701: Kidney Scan, Nuclear Medicine
CPT code 78701 represents a nuclear medicine kidney scan used to assess renal structure and function, including blood flow and tracer transit through the kidneys. These scans can be performed as a cortical study to delineate kidney shape or as a functional study to measure how quickly and effectively the radionuclide passes through the kidney and drains into the bladder. The code is relevant nationally for nephrology, urology, radiology, and nuclear medicine practices involved in diagnosing obstructive uropathy, renal perfusion defects, and functional renal impairment.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the service, typical sites of care, and an overview of billing considerations relevant to institutional and professional billing lines. The publication also summarizes common modifiers associated with imaging services, where available, and points to areas where policy updates or payer-specific coverage rules can affect reimbursement and prior authorization requirements.
This summary is intended for national audiences including clinicians, practice managers, and revenue cycle professionals seeking a clear description of the service, payer landscape, and the operational contexts in which CPT code 78701 is billed.
Billing Code Overview
CPT code 78701 describes a nuclear medicine kidney scan used to evaluate kidney structure, function, and renal blood flow. The procedure includes two primary approaches: a cortical scan to define kidney shape and a functional scan to measure tracer transit through the kidney, collection in the urine, and drainage into the bladder.
Service type: Nuclear medicine diagnostic imaging of the kidneys, encompassing both anatomic (cortical) and physiologic (functional) assessment.
Typical site of service: Hospital outpatient imaging departments, freestanding nuclear medicine centers, and ambulatory surgical centers with nuclear medicine capabilities.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred from nephrology or urology for a nuclear medicine renal scan to evaluate renal perfusion, function, and drainage. Common presentations include suspected renovascular hypertension, unilateral or bilateral decreased kidney function on serum testing or ultrasound, obstructive uropathy with hydronephrosis, suspected renal cortical scarring after recurrent urinary tract infections, or evaluation of differential renal function prior to surgery. The clinical workflow begins with outpatient or hospital ordering by the treating physician, pre-procedure screening for allergies and pregnancy status, and informed consent. On the day of service the patient arrives to the nuclear medicine or radiology department (typical site of service: outpatient imaging center, hospital radiology/nuclear medicine department, or inpatient imaging suite). An intravenous line is placed, the appropriate radiopharmaceutical is administered, and dynamic imaging is acquired over the kidneys for functional studies or static cortical imaging for morphological evaluation. Images are processed and quantitative measurements (e.g., differential renal function, time-to-peak, drainage curves) are generated. A nuclear medicine physician interprets the study and issues a report that is routed to the referring provider for management decisions such as angiography, intervention, or conservative therapy.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician interpretation portion separate from technical component |