The Centers for Medicare & Medicaid Services should educate providers on documentation and time requirements for ACP services to comply with Federal requirements. (That is, when another service is performed concurrently with a time-based service, the time associated with the concurrent service should not be included in the time used for reporting the time-based service, and time and ACP discussion must be documented). Had the requirements been followed, Medicare could have saved an estimated $42,266,931 during our audit period.