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LetterAcronymDefinition
Medicare (Part A)Part of the Medicare law providing benefits for hospitalization, extended care and nursing home care to Medicare beneficiaries with no premium payment.
Medicare (Part B)Part of the Medicare law providing medical-surgical benefits to Medicare beneficiaries for a modest premium.
Medigap555-555-0199@example.com
MemberAn eligible individual who is enrolled in an insurance plan. A member may be a subscriber or a dependent.
Mental Health ServicesServices primarily to treat any disorder that affects the mind or behavior.
MEOBMedicare Explanation of Benefits
MHAMaryland Hospital Association
MHINMaryland Health Information Network
MMMajor Medical
MPOSMaryland Point of Service
MSGRMaryland Small Group Reform
MSSOPMandatory Second Surgical Opinion Program
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OBRAOmnibus Budget Reconciliation Act of 1986
Occupational TherapyTreatment of a physically disabled person by means of constructive activities designed and adapted to promote restoration of the person's ability to perform activities of daily living and those tasks required by the person's particular occupation or role. It is not recreational or diversionary therapy.
OCLOutstanding Claims Liability
OOA/ITSOut-of-Area Program/Inter-Plan Teleprocessing Services
OOPOut-of-Pocket
OPOutpatient
OPAPOutpatient Pre-Treatment Authorization Plan
Open EnrollmentDesignated period of time during which an employee may enroll in group health coverage. Also, designated period of time during the year when individuals without group coverage may enroll in health coverage without needing medical underwriting.
OPLOther Party Liability
Out-of-Pocket Limit or Out-of-Pocket MaximumThe maximum dollar amount a member will pay out-of-pocket in coinsurance, copays and/or deductibles in a calendar year for covered indemnity expenses. Once the out-of-pocket limit is met, the plan pays 100% of the allowed amount for covered services for the rest of the benefit period.
Out of NetworkThe use of health care providers who have not contracted with the health plan to provide services. HMO members are generally not covered for out-of-network services except in emergency situations. Members enrolled in Preferred Provider Organizations (PPO) and Point-of-Service (POS) coverages can go out-of-network, but will pay higher out-of-pocket costs.
OutpatientPatient who receives hospital care without being admitted as an inpatient.
Outpatient SurgerySurgical procedures performed that do not require an overnight stay in the hospital or ambulatory surgery facility. Such surgery can be performed in the hospital, surgery center or physician's office.
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