I have an elderly patient, on Medicare, who was in the office for a covered visit. We are a non-participating office, so the patient paid at the time of service, and will be reimbursed by Medicare. 2 weeks later she contacts the office saying she forgot that she had hurt herself on a motorized shopping cart at Walmart and wanted to know the "full" charge for the service so that Walmart could pay her. Comes down to she wanted Medicare to reimburse her for the information we had, and Walmart for the injury she claims she had, but that we have no record of, both for the same service. Obviously I want to record this incident, but where can I record it, that the patient does not get the opportunity to see it in her record and request a correction.