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36.4.9.9 Esophageal pH Probe Monitoring
Esophageal pH monitoring uses an indwelling pH microelectrode positioned just above the esophageal sphincter. The pH electrode and skin reference electrode are connected to a battery-powered pH meter and transmitter worn as a shoulder harness. The esophageal pH is monitored continuously and a strip chart is used to record the pH determinations. The patient is usually monitored for a 24-hour period. Esophageal pH monitoring is a medically appropriate adjunct procedure to help establish the presence or absence of gastroesophageal reflux.
The following diagnosis codes are payable for esophageal pH probe monitoring or gastroesophageal reflux study to evaluate esophageal reflux:
Esophageal pH probe monitoring should be coded with the following procedure codes: 2/F-91034, 2/F-91035, and 4/I/T-78262.
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