Summary & Overview
CPT 84485: Trypsin Measurement in Duodenal Fluid
CPT code 84485 denotes a laboratory assay that measures trypsin concentration in duodenal fluid from the small intestine, a test used to evaluate pancreatic exocrine function and certain malabsorption or maldigestion conditions. Nationally, this specialized assay is relevant for clinicians and laboratories involved in the diagnostic workup of chronic pancreatitis, cystic fibrosis evaluation, and other disorders affecting pancreatic enzyme secretion. Availability and utilization influence diagnostic pathways and lab resource allocation.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines payer coverage patterns, typical billing considerations, and clinical context that drive use of the test.
Readers will learn a concise clinical and billing overview of CPT code 84485, the typical service setting and clinical indications, and what information is available for operational planning. The report provides benchmarks where available, notes on common billing modifiers, and highlights gaps in standardized coding or payer guidance. Data not available in the input are identified explicitly, and the content focuses on nationally applicable information for clinicians, laboratory managers, and billing professionals.
Billing Code Overview
CPT code 84485 represents a laboratory assay in which a lab analyst measures the concentration of trypsin in duodenal fluid obtained from the small intestine. This test is a diagnostic laboratory service used to assess pancreatic exocrine function and gastrointestinal digestive enzyme activity.
Service type: Laboratory diagnostic test
Typical site of service: Hospital laboratory, outpatient clinical laboratory, or specialized gastrointestinal testing facility
Data not available in the input for associated taxonomies, ICD-10 diagnoses, or related codes.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred by a gastroenterologist for measurement of pancreatic enzyme function due to malabsorption, chronic diarrhea, weight loss, or suspected exocrine pancreatic insufficiency. The clinical workflow begins with history and physical exam, basic laboratory testing, and noninvasive pancreatic function tests (fecal elastase, serum trypsinogen). When noninvasive testing is inconclusive, the patient undergoes endoscopic collection of duodenal fluid — often during an upper endoscopy (esophagogastroduodenoscopy) or with a nasoduodenal tube — for quantitative trypsin assay. The specimen is labeled and sent to the clinical chemistry laboratory. The lab analyst performs the enzymatic assay described by CPT 84485 to measure trypsin activity in duodenal fluid. Results are reported to the ordering provider and used to confirm exocrine pancreatic insufficiency or to evaluate pancreatic secretory function in the context of chronic pancreatitis, cystic fibrosis, or post-pancreatic surgery follow-up.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the physician/interpretive component if the laboratory technical component is billed separately. |
TC |