CPT® Code 91117

Colon motility (manometric) study, minimum 6 hours continuous recording (including provocation tests, eg, meal, intracolonic balloon distension, pharmacologic agents, if performed), with interpretation and report

The CPT® Code 91117 refers to a colon motility (manometric) study that involves a minimum of six hours of continuous recording, which may include various provocation tests such as a meal, intracolonic balloon distension, and pharmacologic agents if performed. This diagnostic procedure is primarily utilized to evaluate patients experiencing severe constipation, particularly to ascertain whether the underlying cause is due to colonic inertia. During the manometric study, a specialized thin probe equipped with multiple microsensors and a small balloon is inserted into the rectum and advanced into the colon. This probe is connected to a computerized device that meticulously records the muscle and nerve activity within the colon as it is maneuvered through the intestinal tract. The data collected during the procedure is graphically represented on a computer monitor, allowing for real-time observation of colonic contractions. To further assess colonic function, a series of provocation tests are conducted. For instance, the patient may be administered a 1000-calorie meal, after which muscle tone and sensory changes are monitored over a period of one hour or more. Additionally, the intracolonic balloon distension test is performed, which involves the inflation and deflation of the balloon with small amounts of air multiple times to evaluate the muscle responses of the colon. In some cases, a pharmacologic agent may be introduced to stimulate colon contractions, with the corresponding muscle and nerve activity being recorded. Upon completion of the study, the manometry probe, along with its sensors and balloon, is carefully removed. The physician then analyzes the recorded data and provides a comprehensive written interpretation of the findings, which is essential for determining the appropriate clinical management of the patient’s condition.