Modifier 25 must be appended to the service and submitted without the vaccine diagnosis code. If done by time, it is a 5 minute visit.
If the patient is coming in strictly for an immunization, and there is no counseling or work up for any other issue or side effect, only the Immunization code should be submitted.
If you are counseling the patient on the immunization itself there are codes for the administration with counseling (they may reimburse at a higher level than the regular admin codes). The codes are: 90460 and 90461.