What is the Medical Glossary?

Browse our complete A-Z glossary of medical terms, drugs, conditions, procedures, hospitals, and healthcare organizations.

What healthcare terms are defined in the MedicalRecords.com glossary?

The MedicalRecords.com glossary covers medical records terminology, healthcare IT acronyms, insurance terms, clinical vocabulary, regulatory terms (HIPAA, HITECH), and EHR/EMR industry definitions. It is designed for patients, healthcare professionals, and technology buyers seeking clear explanations.

What does EMR stand for in healthcare?

EMR stands for Electronic Medical Record. It is a digital version of the paper charts kept in a clinician's office, containing a patient's medical and treatment history from a single practice. Unlike EHRs (Electronic Health Records), EMRs are not typically designed to share information outside the practice.

What is HIPAA and why does it matter for medical records?

HIPAA (Health Insurance Portability and Accountability Act) is a federal law that establishes standards to protect sensitive patient health information. Under HIPAA, patients have the right to access and obtain copies of their medical records, and covered entities must respond to records requests within 30 days.

What is the difference between an EHR and an EMR?

An EMR (Electronic Medical Record) is a digital record used within a single practice. An EHR (Electronic Health Record) is designed to be shared across multiple healthcare settings — different physicians, hospitals, labs, and specialists — giving a broader view of a patient's care history.

Medical Glossary | A-Z Entity Directory

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M&D Capital Premier Billing LLC Data Breach (2024)

Event

M&D Capital Premier Billing LLC data breach in NY affecting 284,326 individuals. Reported 2024-03-21.

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MCG Health, LLC Data Breach (2022)

Event

MCG Health, LLC data breach in WA affecting 793,283 individuals. Reported 2022-06-10.

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MDLand International Corporation Data Breach (2025)

Event

MDLand International Corporation data breach in NY affecting 22,586 individuals. Reported 2025-08-04.

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MHMR Authority of Brazos Valley Data Breach (2023)

Event

MHMR Authority of Brazos Valley data breach in TX affecting 78,984 individuals. Reported 2023-02-28.

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Mainline Health Systems Inc Data Breach (2025)

Event

Mainline Health Systems Inc data breach in AR affecting 101,104 individuals. Reported 2025-06-23.

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Managed Care of North America (MCNA) Data Breach (2023)

Event

Managed Care of North America (MCNA) data breach in GA affecting 8,861,076 individuals. Reported 2023-05-26.

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Marathon County Special Education Data Breach (2023)

Event

Marathon County Special Education data breach in WI affecting 10,079 individuals. Reported 2023-12-20.

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Marian Village Corporation, d/b/a/ Marywood Nursing Care Center (“Marywood”) Data Breach (2024)

Event

Marian Village Corporation, d/b/a/ Marywood Nursing Care Center (“Marywood”) data breach in MI affecting 6,178 individuals. Reported 2024-01-24.

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Marshfield Clinic Health System Data Breach (2025)

Event

Marshfield Clinic Health System data breach in WI affecting 35,952 individuals. Reported 2025-11-07.

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Mason Tenders’ District Council Welfare Fund Data Breach (2022)

Event

Mason Tenders’ District Council Welfare Fund data breach in NY affecting 13,344 individuals. Reported 2022-06-16.

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Mattax Neu Prater Eye Center, Inc. Data Breach (2022)

Event

Mattax Neu Prater Eye Center, Inc. data breach in MO affecting 92,361 individuals. Reported 2022-06-28.

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Maximus, Inc. Data Breach (2023)

Event

Maximus, Inc. data breach in VA affecting 2,781,617 individuals. Reported 2023-08-04.

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Mayo Clinic Data Breach (2024)

Event

Mayo Clinic data breach in MN affecting 120,000 individuals. Reported 2024-06-05.

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McAlester Regional Health Center Data Breach (2023)

Event

McAlester Regional Health Center data breach in OK affecting 37,731 individuals. Reported 2023-08-21.

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McKenzie Health System Data Breach (2022)

Event

McKenzie Health System data breach in MI affecting 25,318 individuals. Reported 2022-05-10.

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McKenzie Memorial Hospital Data Breach (2025)

Event

McKenzie Memorial Hospital data breach in MI affecting 58,839 individuals. Reported 2025-07-24.

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McLaren Health Care Data Breach (2025)

Event

McLaren Health Care data breach in MI affecting 743,131 individuals. Reported 2025-06-24.

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McNall & Associates, P.C. Data Breach (2025)

Event

McNall & Associates, P.C. data breach in AK affecting 10,175 individuals. Reported 2025-01-08.

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McPherson Hospital, Inc. Data Breach (2022)

Event

McPherson Hospital, Inc. data breach in KS affecting 19,020 individuals. Reported 2022-09-26.

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MedInform, Inc. Data Breach (2023)

Event

MedInform, Inc. data breach in OH affecting 14,453 individuals. Reported 2023-05-24.

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MedMinder Systems, Inc. Data Breach (2023)

Event

MedMinder Systems, Inc. data breach in MA affecting 12,146 individuals. Reported 2023-09-01.

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Medical Associates of Brevard, LLC Data Breach (2025)

Event

Medical Associates of Brevard, LLC data breach in FL affecting 246,711 individuals. Reported 2025-09-05.

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Medical Associates of the Lehigh Valley Data Breach (2022)

Event

Medical Associates of the Lehigh Valley data breach in PA affecting 75,628 individuals. Reported 2022-09-09.

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Medical Billing Specialists, Inc. Data Breach (2024)

Event

Medical Billing Specialists, Inc. data breach in MA affecting 43,673 individuals. Reported 2024-04-24.

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Medical Center, LLP Data Breach (2025)

Event

Medical Center, LLP data breach in GA affecting 32,090 individuals. Reported 2025-12-19.

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Medical College of Wisconsin Data Breach (2023)

Event

Medical College of Wisconsin data breach in WI affecting 240,667 individuals. Reported 2023-11-14.

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Medical Express Ambulance Inc. D/B/A Medex Ambulance Data Breach (2024)

Event

Medical Express Ambulance Inc. D/B/A Medex Ambulance data breach in IL affecting 121,190 individuals. Reported 2024-05-02.

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Medical Eye Services, Inc. Data Breach (2023)

Event

Medical Eye Services, Inc. data breach in NY affecting 377,931 individuals. Reported 2023-11-14.

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Medusind Inc. Data Breach (2025)

Event

Medusind Inc. data breach in FL affecting 701,475 individuals. Reported 2025-01-07.

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Memorial Hospital Data Breach (2024)

Event

Memorial Hospital data breach in TX affecting 75,000 individuals. Reported 2024-09-20.

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Memorial village er Data Breach (2022)

Event

Memorial village er data breach in TX affecting 80,000 individuals. Reported 2022-02-19.

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Mendocino Community Health Clinic Inc. Data Breach (2025)

Event

Mendocino Community Health Clinic Inc. data breach in CA affecting 3,538 individuals. Reported 2025-12-29.

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Mental Health Association Inc. Data Breach (2025)

Event

Mental Health Association Inc. data breach in MA affecting 12,633 individuals. Reported 2025-01-31.

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Mental Health Center of North Central Alabama, Inc. Data Breach (2024)

Event

Mental Health Center of North Central Alabama, Inc. data breach in AL affecting 75,667 individuals. Reported 2024-02-16.

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Mercer County Joint Township Community Hospital Data Breach (2025)

Event

Mercer County Joint Township Community Hospital data breach in OH affecting 88,541 individuals. Reported 2025-03-26.

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Mercy Medical Center - Clinton, Inc. Data Breach (2023)

Event

Mercy Medical Center - Clinton, Inc. data breach in IA affecting 20,865 individuals. Reported 2023-06-02.

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Mercy Medical Center Data Breach (2023)

Event

Mercy Medical Center data breach in IA affecting 97,132 individuals. Reported 2023-12-08.

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Meridian Behavioral Healthcare, Inc. Data Breach (2023)

Event

Meridian Behavioral Healthcare, Inc. data breach in FL affecting 98,808 individuals. Reported 2023-12-22.

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Methodist Craig Ranch Surgical Center Data Breach (2022)

Event

Methodist Craig Ranch Surgical Center data breach in TX affecting 15,157 individuals. Reported 2022-08-26.

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Methodist McKinney Hospital Data Breach (2022)

Event

Methodist McKinney Hospital data breach in TX affecting 110,244 individuals. Reported 2022-08-26.

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Metropolitan Area EMS Authority dba MedStar Mobile Healthcare Data Breach (2022)

Event

Metropolitan Area EMS Authority dba MedStar Mobile Healthcare data breach in TX affecting 612,000 individuals. Reported 2022-12-19.

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Michael R. Schwartz, MD Inc. Data Breach (2025)

Event

Michael R. Schwartz, MD Inc. data breach in CA affecting 9,080 individuals. Reported 2025-10-23.

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Michigan Avenue Immediate Care Data Breach (2022)

Event

Michigan Avenue Immediate Care data breach in IL affecting 144,104 individuals. Reported 2022-06-30.

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Michigan Orthopaedic Surgeons Data Breach (2023)

Event

Michigan Orthopaedic Surgeons data breach in MI affecting 67,477 individuals. Reported 2023-12-19.

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Mid America Physician Services Data Breach (2025)

Event

Mid America Physician Services data breach in KS affecting 104,513 individuals. Reported 2025-01-13.

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Mid Florida Primary Care, PA Data Breach (2025)

Event

Mid Florida Primary Care, PA data breach in FL affecting 16,435 individuals. Reported 2025-03-21.

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Mid Michigan Medical Billing Service, Inc. Data Breach (2026)

Event

Mid Michigan Medical Billing Service, Inc. data breach in MI affecting 28,185 individuals. Reported 2026-01-05.

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Mid-Ohio Psychological Services Inc. Data Breach (2024)

Event

Mid-Ohio Psychological Services Inc. data breach in OH affecting 40,345 individuals. Reported 2024-11-01.

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Midwest Long Term Care Services DBA Senior Scripts Data Breach (2024)

Event

Midwest Long Term Care Services DBA Senior Scripts data breach in MO affecting 10,566 individuals. Reported 2024-01-02.

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Milan Eye Center Data Breach (2023)

Event

Milan Eye Center data breach in GA affecting 67,336 individuals. Reported 2023-08-23.

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Millcreek Pediatrics Data Breach (2024)

Event

Millcreek Pediatrics data breach in DE affecting 14,095 individuals. Reported 2024-11-21.

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Millcreek Pediatrics Data Breach (2025)

Event

Millcreek Pediatrics data breach in DE affecting 14,095 individuals. Reported 2025-11-21.

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MiniMed Distribution Corp. Data Breach (2023)

Event

MiniMed Distribution Corp. data breach in CA affecting 58,374 individuals. Reported 2023-04-14.

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Minnesota Department of Human Services Data Breach (2026)

Event

Minnesota Department of Human Services data breach in MN affecting 303,965 individuals. Reported 2026-01-16.

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Mission City Community Network, Inc. Data Breach (2025)

Event

Mission City Community Network, Inc. data breach in CA affecting 11,016 individuals. Reported 2025-08-09.

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Missouri Department of Conservation Data Breach (2025)

Event

Missouri Department of Conservation data breach in MO affecting 10,260 individuals. Reported 2025-05-30.

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Missouri Department of Social Services Data Breach (2023)

Event

Missouri Department of Social Services data breach in MO affecting 739,884 individuals. Reported 2023-08-07.

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Modernizing Medicine, Inc. Data Breach (2025)

Event

Modernizing Medicine, Inc. data breach in FL affecting 198,795 individuals. Reported 2025-10-17.

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Monroe Ear Nose and Throat Associates, PC Data Breach (2022)

Event

Monroe Ear Nose and Throat Associates, PC data breach in MI affecting 14,500 individuals. Reported 2022-09-30.

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Monument, Inc. Data Breach (2023)

Event

Monument, Inc. data breach in NY affecting 108,584 individuals. Reported 2023-03-31.

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Morris Hospital & Healthcare Centers Data Breach (2023)

Event

Morris Hospital & Healthcare Centers data breach in IL affecting 248,943 individuals. Reported 2023-08-17.

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Morrison Community Hospital District Data Breach (2023)

Event

Morrison Community Hospital District data breach in IL affecting 122,488 individuals. Reported 2023-11-23.

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Morton Drug Company Data Breach (2024)

Event

Morton Drug Company data breach in WI affecting 40,051 individuals. Reported 2024-11-10.

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Morton Drug Company Data Breach (2025)

Event

Morton Drug Company data breach in WI affecting 40,051 individuals. Reported 2025-11-10.

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Motorola Solutions Data Breach (2025)

Event

Motorola Solutions data breach in IL affecting 22,600 individuals. Reported 2025-11-05.

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Mount Desert Island Hospital, Inc. Data Breach (2023)

Event

Mount Desert Island Hospital, Inc. data breach in ME affecting 29,952 individuals. Reported 2023-06-30.

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Mount Rogers Community Services Data Breach (2025)

Event

Mount Rogers Community Services data breach in VA affecting 38,191 individuals. Reported 2025-06-13.

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Moyes Eye Center, PC Data Breach (2022)

Event

Moyes Eye Center, PC data breach in MO affecting 38,000 individuals. Reported 2022-05-25.

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Mulkay Cardiology Consultants at Holy Name Medical Center, P.C. Data Breach (2023)

Event

Mulkay Cardiology Consultants at Holy Name Medical Center, P.C. data breach in NJ affecting 79,582 individuals. Reported 2023-11-03.

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Murfreesboro Medical Clinic & SurgiCenter Data Breach (2023)

Event

Murfreesboro Medical Clinic & SurgiCenter data breach in TN affecting 559,000 individuals. Reported 2023-06-21.

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Muskogee City County Enhanced 911 Trust Authority Data Breach (2024)

Event

Muskogee City County Enhanced 911 Trust Authority data breach in OK affecting 180,000 individuals. Reported 2024-09-20.

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M

M&D Capital Premier Billing LLC Data Breach (2024)

MCG Health, LLC Data Breach (2022)

MDLand International Corporation Data Breach (2025)

MHMR Authority of Brazos Valley Data Breach (2023)

Mainline Health Systems Inc Data Breach (2025)

Managed Care of North America (MCNA) Data Breach (2023)

Marathon County Special Education Data Breach (2023)

Marian Village Corporation, d/b/a/ Marywood Nursing Care Center (“Marywood”) Data Breach (2024)

Marshfield Clinic Health System Data Breach (2025)

Mason Tenders’ District Council Welfare Fund Data Breach (2022)

Mattax Neu Prater Eye Center, Inc. Data Breach (2022)

Maximus, Inc. Data Breach (2023)

Mayo Clinic Data Breach (2024)

McAlester Regional Health Center Data Breach (2023)

McKenzie Health System Data Breach (2022)

McKenzie Memorial Hospital Data Breach (2025)

McLaren Health Care Data Breach (2025)

McNall & Associates, P.C. Data Breach (2025)

McPherson Hospital, Inc. Data Breach (2022)

MedInform, Inc. Data Breach (2023)

MedMinder Systems, Inc. Data Breach (2023)

Medical Associates of Brevard, LLC Data Breach (2025)

Medical Associates of the Lehigh Valley Data Breach (2022)

Medical Billing Specialists, Inc. Data Breach (2024)

Medical Center, LLP Data Breach (2025)

Medical College of Wisconsin Data Breach (2023)

Medical Express Ambulance Inc. D/B/A Medex Ambulance Data Breach (2024)

Medical Eye Services, Inc. Data Breach (2023)

Medusind Inc. Data Breach (2025)

Memorial Hospital Data Breach (2024)

Memorial village er Data Breach (2022)

Mendocino Community Health Clinic Inc. Data Breach (2025)

Mental Health Association Inc. Data Breach (2025)

Mental Health Center of North Central Alabama, Inc. Data Breach (2024)

Mercer County Joint Township Community Hospital Data Breach (2025)

Mercy Medical Center - Clinton, Inc. Data Breach (2023)

Mercy Medical Center Data Breach (2023)

Meridian Behavioral Healthcare, Inc. Data Breach (2023)

Methodist Craig Ranch Surgical Center Data Breach (2022)

Methodist McKinney Hospital Data Breach (2022)

Metropolitan Area EMS Authority dba MedStar Mobile Healthcare Data Breach (2022)

Michael R. Schwartz, MD Inc. Data Breach (2025)

Michigan Avenue Immediate Care Data Breach (2022)

Michigan Orthopaedic Surgeons Data Breach (2023)

Mid America Physician Services Data Breach (2025)

Mid Florida Primary Care, PA Data Breach (2025)

Mid Michigan Medical Billing Service, Inc. Data Breach (2026)

Mid-Ohio Psychological Services Inc. Data Breach (2024)

Midwest Long Term Care Services DBA Senior Scripts Data Breach (2024)

Milan Eye Center Data Breach (2023)

Millcreek Pediatrics Data Breach (2024)

Millcreek Pediatrics Data Breach (2025)

MiniMed Distribution Corp. Data Breach (2023)

Minnesota Department of Human Services Data Breach (2026)

Mission City Community Network, Inc. Data Breach (2025)

Missouri Department of Conservation Data Breach (2025)

Missouri Department of Social Services Data Breach (2023)

Modernizing Medicine, Inc. Data Breach (2025)

Monroe Ear Nose and Throat Associates, PC Data Breach (2022)

Monument, Inc. Data Breach (2023)

Morris Hospital & Healthcare Centers Data Breach (2023)

Morrison Community Hospital District Data Breach (2023)

Morton Drug Company Data Breach (2024)

Morton Drug Company Data Breach (2025)

Motorola Solutions Data Breach (2025)

Mount Desert Island Hospital, Inc. Data Breach (2023)

Mount Rogers Community Services Data Breach (2025)

Moyes Eye Center, PC Data Breach (2022)

Mulkay Cardiology Consultants at Holy Name Medical Center, P.C. Data Breach (2023)

Murfreesboro Medical Clinic & SurgiCenter Data Breach (2023)

Muskogee City County Enhanced 911 Trust Authority Data Breach (2024)