Summary & Overview
CPT 78299: Unlisted Gastrointestinal Diagnostic Nuclear Medicine Procedure
CPT code 78299 designates an unlisted gastrointestinal diagnostic nuclear medicine procedure and is used when a specific CPT code does not exist for a particular nuclear medicine study of the GI tract. Nationally, use of unlisted codes like 78299 matters because they require additional clinical documentation and often more administrative review than standard codes, affecting claim processing and payment consistency across payers.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical contexts where 78299 is applied, how payers typically handle unlisted GI nuclear medicine procedures, and common themes in billing practices. The publication outlines benchmarks for utilization and payment patterns where available, summarizes relevant policy considerations for documentation and claim submission, and highlights implications for coding workflows.
This national-level summary is intended for revenue cycle managers, coding professionals, and clinicians involved in diagnostic nuclear medicine who need a concise briefing on when 78299 is used, what administrative steps are commonly required, and what to expect from major payers in terms of review and adjudication.
Billing Code Overview
CPT code 78299 is an unlisted gastrointestinal diagnostic nuclear medicine procedure code used to report gastrointestinal nuclear medicine studies that do not have a specific CPT code. This code covers diagnostic nuclear medicine techniques applied to the gastrointestinal tract when no precise, separately listed CPT code exists.
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Service type: Diagnostic gastrointestinal nuclear medicine procedure
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Typical site of service: Outpatient imaging centers, hospital outpatient departments, and other facilities where nuclear medicine diagnostic studies are performed
Clinical & Coding Specifications
Clinical Context
A 58-year-old patient with chronic nausea, intermittent abdominal pain, and unexplained weight loss is referred for a specialized gastrointestinal nuclear medicine study to evaluate gastric emptying and small-bowel transit using a protocol or tracer that does not have a specific CPT code. The patient arrives at an outpatient imaging center after overnight fasting. A technologist reviews history and allergies, explains the test, and administers a radiolabeled meal or tracer. Serial imaging is obtained over several hours to assess tracer transit through the stomach and small intestine. Images are processed and reviewed by a nuclear medicine physician who interprets motility patterns, retention times, and focal areas of delayed transit. The final report documents quantitative gastric emptying values, qualitative transit findings, and correlation with clinical symptoms. The study is scheduled in the outpatient nuclear medicine department or hospital imaging suite, with the typical site of service being an outpatient radiology or nuclear medicine facility or hospital-based imaging department.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work, time, or complexity substantially exceeds typical expectations for the procedure and documentation supports the increased resources. |
26 |