Michael last visited his physician, which is a single-physic…

Michael last visited his physician, which is a single-physician office practice, in September 2006. He is at the office today for a sore throat and chest congestion. Since he was already a patient, the medical insurance coder submitted an established patient E/M code to Michael’s insurance carrier for payment. The insurance carrier requested additional documentation regarding the visit. Which of the following may have been the reason?