- Maintenance
- Malicious Software
- Managed Care Organization (MCO)
- Marketing
- Massachusetts Health Data Consortium (MHDC)
- Maximum Defined Data Set
- Medical Code Sets
- Medical Records Institute (MRI)
- Medicare Benefits Notice (MBN)
- Medicare Remittance Advice Remark Codes
- Medicare Summary Notice (MSN)
- Memorandum of Understanding (MOU)
- Minimum Necessary Information: Use or Requests
- Minimum Scope of Disclosure
- Minnesota Center for Healthcare Electronic Commerce (MCHEC)
- Minnesota EDI Healthcare Users Group (MEHUG)
- Minnesota Health Data Institute (MHDI)
- Modification