Modifier 25 indicates significant, separately identifiable e/m was provided. If this is the case you also have to bill the appropriate J code to identify what was given. I don't believe that the 90772 will be paid without identifying the drug. I would appeal with medical records showing the documentation of the office visit to justify the charge for the e/m. If the Dr. didn't document an e/m and the patient was only seen for the purpose of giving the shot, the denial is appropriate.