I work in an audiology outpatient clinic. I had two audiologist see the same patient on the same day. Audiologist “A” billed 92567 and the “B” billed 92555. The following week the same incident occurred but with a different patient. This time Audiologist “A” billed 92550 and “B” billed 92579. Is there any coding or billing guidelines stating or not that two audiologist can bill different diagnostic testing from the same location, with two different NPI’s , and on the same day of service?