MEDICAL OFFICE QUESTION. NEEDS SOME ANSWERS PLEASE..DON'T UNDERSTAND IT.?

You receive an EOB for a patient who is covered by an HMO. The HMO did not pay for services received on May 5, which is when the patient visited Dr. Larsen for her annual Pap smear. You check your records and find that the same insurance carrier paid for previous Pap smears with the same patient in past years. What should you do?