CPT® Code 91133

1. Indications

Electrogastrography (EGG) is indicated for patients presenting with various gastrointestinal symptoms that may suggest underlying motility disorders. The following conditions warrant the performance of this diagnostic procedure:

• Persistent Nausea Patients experiencing ongoing feelings of nausea that do not resolve with standard treatments may require EGG to investigate potential motility issues.
• Vomiting Individuals who frequently vomit, particularly when the cause is unclear, can benefit from EGG to assess gastric function and identify any dysrhythmias.
• Early Satiety Patients who feel full after consuming only a small amount of food may have underlying motility disorders that EGG can help diagnose.
• Epigastric Discomfort Those suffering from discomfort in the upper abdomen may have motility issues that can be evaluated through EGG.

2. Procedure

The procedure for diagnostic transcutaneous electrogastrography with provocative testing involves several key steps to ensure accurate assessment of gastric electrical activity:

• Sensor Placement Initially, sensors are strategically placed on the skin of the abdomen to record the electrical signals generated by the stomach. The optimal placement is determined to ensure the best quality of recordings.
• Fasting EGG Recording Once the sensors are in place, a fasting EGG recording is obtained. This baseline measurement captures the stomach's electrical activity in a resting state, providing essential data for comparison.
• Post-Prandial Recording After the fasting recording, the patient consumes a meal, and a post-prandial EGG recording is taken. This step evaluates how the stomach responds to food intake and helps identify any abnormalities in motility.
• Provocative Testing Following the post-prandial recording, a provocative test is administered. This may involve intravenous infusion of a drug such as edrophonium or water loading. Additional recordings are made during this phase to assess the stomach's response to the provocative stimulus.
• Data Comparison and Evaluation The recordings obtained from the fasting, post-prandial, and provocative tests are then compared and evaluated. This comprehensive analysis allows the physician to identify any significant changes in EGG amplitude and frequency, which are critical for diagnosing motility disorders.

3. Post-Procedure

After the completion of the electrogastrography procedure, the physician interprets the collected data and prepares a written report detailing the findings. This report includes an analysis of the EGG recordings from the fasting, post-prandial, and provocative tests, highlighting any abnormalities detected. The results are crucial for guiding further clinical decisions and treatment options for the patient. Patients may be advised on any necessary follow-up appointments or additional testing based on the findings of the EGG.