Medical Data Files provide the most up-to-date medical data files in a variety of file formats that include Excel, ASCII, Access, dBASE, and FoxPro. published by Wasserman, AMA, Ingenix and Contexo (AMA/ADA). The data files are utilized by providers and third party payers such as insurance companies, managed care (HMO/PPO), TPAs, billing services, and software developers.