M
MAC - mandatory access control (access control model typically found in military or government intelligence agencies, with stringent security and secrecy requirements (most restrictive of the access control models))
MAC - media access control (unique address assigned by manufacturers to each hardware device manufactured)
MAC - message authentication code (a value that is calculated during an encryption process and appended to data to protect against tampering during transmission)
MACRA - Medicare Access and CHIP (Children's Health Insurance Program) Reauthorization Act of 2015 (2015 federal legislation designed to provide measures of value and encourage outcomes through an incentive reimbursement system)
MD - Medical Doctor (a medical practitioner, either a physician or surgeon, with an advanced academic degree in medicine - after an internship and a residency assignment in the U.S., an MD must be tested and licensed by a certification board)
MDDS - medical devices' data systems
MDISS - Medical Device Innovation, Safety, and Security Consortium (nonprofit public health and patient safety organization focused on medical device cybersecurity)
MDM - Mobile Device Management (software which manages/controls mobile devices)
MDS2 - Manufacturer Disclosure Statement for Medical Device Security (form completed by medical device manufacturers and provided to customers to document a device's significant security features)
MHS - Military Health System (U.S. Department of Defense System which provides health benefits for active-duty service members, military retirees, as well as their dependents, through military hospitals and a managed-care network (TRICARE))
MIPS - Merit-Based Incentive Payment System (Medicare reimbursement payment plan designed to encourage innovation and better outcomes)
MIT - Massachusetts Institute of Technology (Massachusetts university noted for its research and technology specialty)
MIT - Medical Identity Theft (theft of personally identifiable health information)
MMRS - Metropolitan Medical Response System
MOU - Memorandum of Understanding (formal written agreement between a healthcare organization and a third party contractor containing details about the roles and responsibilties of each party)
MRC - Medical Research Council (organization which provides guidelines for the conduct of medical research)
MRI - magnetic resonance image scanner (high-tech equipment which can provide images of human organs)
MSEHPA - Model State Emergency Health Powers Act
MSN - Master of Science in Nursing (an advanced-level postgraduate degree for registered nurses in medical practices and other healthcare delivery settings)
MSSP - managed security service provider (outside party hired to provide outsourced monitoring and management of security devices and systems, such as firewalls and intrusion prevention appliances)
MTD - maximum tolerable downtime (amount of time an organization can function without an application or process before a significant impact occurs)