Wiki 24 Hour pH study DOS billing?

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when a nasal catheter is placed for a 24 hour study, the patient comes in the next day to have it removed and the analysis and interp, what date of service do i use for the 91038?
 
You would bill on the date the catheter is removed and the interpretation done. Also, 91038 is for esophageal manometry - if this is just a 24 hour catheter based pH test you would use 91034 instead.
 
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