Acceptable certifying bodies include: Allied American Health (AAH), American Association of Medical Assistants (AAMA), American Medical Technologists (AMT), American Registry of Medical Assistants (ARMA) - Foreign Medical and Nurses Graduates only, National Association of Health Professionals (NAHP), National Association of Healthcare Technicians (NAHT), National Center for Competency Testing (NCCT), National Healthcareer Association (NHA), Medical Career Assessment (MedCA), and American Medical Certification Association (AMCA). As the nation's largest provider of senior-focused primary care, one of the largest providers of home health services, and fourth largest pharmacy benefit manager, CenterWell is focused on whole-person health by addressing the physical, emotional and social wellness of our patients.