Summary & Overview
HCPCS C9787: Gastric Electrophysiology Mapping with Symptom Profiling
HCPCS Level II code C9787 designates gastric electrophysiology mapping performed together with simultaneous patient symptom profiling. The code captures a diagnostic procedure that links gastric electrical activity with real-time symptom reporting, supporting evaluation of gastric motility disorders and guiding clinical decision-making. Nationally, precise procedural coding for advanced gastric motility testing matters for consistent clinical documentation, claims processing, and accurate utilization tracking as these specialized services become more available.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find a concise overview of the code’s clinical context, where the service is typically delivered, and which payers are commonly responsible for coverage decisions. The report outlines expected service lines and sites of care, common modifiers associated with similar advanced diagnostic procedures (listed separately), and notes where input data was not provided.
This publication is intended to inform healthcare administrators, coding professionals, and policy analysts about the clinical purpose of C9787, typical care settings, and the payer landscape that influences adoption and reimbursement patterns for gastric electrophysiology mapping with symptom profiling.
Billing Code Overview
HCPCS Level II code C9787 describes gastric electrophysiology mapping with simultaneous patient symptom profiling. This procedure captures electrical activity of the stomach while concurrently recording patient-reported symptoms to correlate motility or dysrhythmia findings with clinical manifestations.
Service type: diagnostic electrophysiologic mapping with symptom correlation
Typical site of service: hospital outpatient department or specialized gastrointestinal motility lab
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 42-year-old patient with months of refractory nausea, early satiety, postprandial bloating and intermittent abdominal pain is referred for advanced gastric functional testing. Prior workup included upper endoscopy with biopsy, abdominal imaging, and trials of prokinetic and antiemetic therapy without sustained benefit. The gastroenterology team schedules C9787 (gastric electrophysiology mapping with simultaneous patient symptom profiling) to characterize gastric slow-wave patterns and correlate dysrhythmias with real-time symptom events.
The procedure is performed in an outpatient endoscopy or motility laboratory. The patient presents fasting, with pre-procedure consent and explanation of symptom logging. Under conscious sedation or monitored anesthesia care as appropriate, cutaneous or endoscopically placed electrode arrays are positioned on the abdominal surface or serosal surface to record high-resolution gastric myoelectrical activity. A concurrent symptom-profiling device or electronic diary is started so the patient marks nausea, pain, bloating, and fullness during baseline, provocation (eg, meal challenge), and recovery periods. Recording typically lasts from 30 minutes to several hours depending on protocol. Clinicians interpret mapping to identify gastric dysrhythmias (eg, bradygastria, tachygastria, conduction block), spatial propagation abnormalities, and temporal correlation with symptom events to guide diagnosis (eg, gastroparesis, functional dyspepsia) and therapeutic planning (dietary modification, gastric neurostimulation consideration, medication adjustment).
Coding Specifications
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