Maine Subscriber
Answer: Although you did not complete the 24-hour test you originally intended, your case is not a discontinued service.
If your gastroenterologist read and interpreted the four hours' worth of recording you did obtain, you should use 91034 (Esophagus, gastroesophageal reflux test; with nasal catheter pH electrode[s] placement, recording, analysis and interpretation). Because your physician was able to complete part of this service, you can use this code.
Catch this: CPT deleted 91032 and 91033 a few years ago. You would have used them to distinguish between short-duration pH testing and prolonged pH testing. Now, for any nasal catheter pH testing, you'll use 91034.
Don't forget: If this service had taken place in a hospital setting and your practice did not own the equipment used for the test, you would report 91034 with modifier 26 (Professional component).