This Medicare glossary is designed to explain common Medicare words and acronyms in simple, everyday language. You can scroll through the sections by letter or use your browser’s Find feature to jump to a specific term.
These definitions are meant to help you understand your options so you can have more confident conversations about Medicare. They are summaries, not legal definitions, and they do not replace the official information from Medicare or your plan documents.
If you do not see a term you are looking for, or if anything is still unclear, you are always welcome to reach out for no-cost, personal guidance.
Annual Enrollment Period (AEP): The time each year, usually October 15 to December 7, when most people with Medicare can change their Medicare Advantage or Part D drug plan for the next year.
Appeal: The formal process you use to ask Medicare or your plan to review and change a coverage or payment decision you disagree with.
Assignment: An agreement where a doctor or other provider accepts the Medicare-approved amount as full payment for covered services. This usually means lower out-of-pocket costs for you.
Beneficiary: The person who has Medicare coverage. If you are enrolled in Medicare, you are the Medicare beneficiary.
Benefit Period: For Original Medicare Part A, the way Medicare measures your use of hospital and skilled nursing facility services. It starts the day you are admitted as an inpatient and ends when you have been out of the hospital or facility for 60 days in a row.
Coinsurance: A percentage of the cost you pay for a covered service after you have met your deductible. For example, you might pay 20% and the plan pays 80%.
Copay (Copayment): A fixed dollar amount you pay for a specific service or prescription, such as paying $10 to see your primary doctor or $35 for a certain medication.
Cost Sharing: The general term for the money you pay out of pocket for covered services, including deductibles, copays, and coinsurance.
Coverage Gap (Donut Hole): A stage in many Part D drug plans where your share of the cost for prescriptions may increase for a period of time until you reach another spending limit.
Creditable Coverage: Other health or drug coverage that is considered as good as or better than Medicare’s standard coverage. Having creditable coverage can help you avoid certain late-enrollment penalties later on.
Deductible: The amount you pay out of pocket for covered services before your plan starts to share the costs. Some deductibles apply once per year; others may apply to certain services only.
Durable Medical Equipment (DME): Medical equipment that you can use at home for a long time, such as wheelchairs, walkers, oxygen equipment, or blood sugar monitors, when prescribed and covered by Medicare.
Emergency Care: Care you receive for a sudden, serious medical condition that could threaten your life or health if you do not get help right away. Most plans cover emergency care anywhere in the United States.
Evidence of Coverage (EOC): The official document from your Medicare plan that explains in detail what is covered, what you pay, and your rights and responsibilities.
Exclusion: A service or item that is not covered by your Medicare plan. If something is excluded, you may have to pay the full cost yourself.
Extra Help: A program that helps people with limited income and resources pay for their Medicare Part D prescription drug costs, including premiums, deductibles, and copays.
Formulary: The official list of prescription drugs covered by a Part D or Medicare Advantage plan. It usually shows which tier each drug is in and any rules that apply.
Generic Drug: A medication that has the same active ingredients and works the same way as a brand-name drug, usually at a lower cost.
Grievance: A complaint you make to your Medicare plan about the quality of care or service you received, separate from questions about payment or coverage decisions.
Hospice Care: Special care and support for people with a terminal illness who are not seeking a cure, focusing on comfort, pain relief, and emotional support for the patient and family.
In-Network Provider: A doctor, hospital, or other provider that has a contract with your Medicare Advantage or other health plan. Using in-network providers usually means lower costs for you.
Lifetime Reserve Days: Extra inpatient hospital days that Original Medicare gives you to use over your lifetime after you have used your standard benefit days. You pay more when you use these, and once they are used, they are gone.
Medicaid: A state and federal program that helps people with limited income and resources pay for health care costs. Some people have both Medicare and Medicaid (often called “dual eligible”).
Medically Necessary: Health care services or supplies that are needed to diagnose or treat an illness, injury, condition, or its symptoms and that meet accepted standards of medical practice.
Medicare Advantage Plan (Part C): A type of Medicare plan offered by private insurance companies that provides your Part A and Part B benefits, and often includes drug coverage and extra benefits like dental or vision.
Medicare Supplement Insurance (Medigap): A policy sold by private insurance companies that helps pay some of the costs that Original Medicare does not fully cover, such as copays, coinsurance, and deductibles.
Network: The group of doctors, hospitals, pharmacies, and other providers that have agreed to work with a Medicare Advantage or other health plan.
Open Enrollment Period (OEP): A specific time each year when certain changes are allowed. For example, the Medicare Advantage Open Enrollment Period (January 1 to March 31) lets people already in a Medicare Advantage plan switch to another plan or go back to Original Medicare.
Out-of-Pocket Maximum: The most you will pay in a year in deductibles, copays, and coinsurance for covered services under a Medicare Advantage plan. After you reach this limit, the plan pays 100% of covered services for the rest of the year.
Part A (Hospital Insurance): The part of Medicare that helps pay for inpatient hospital stays, skilled nursing facility care, some home health care, and hospice care.
Part B (Medical Insurance): The part of Medicare that helps pay for doctor visits, outpatient care, preventive services, lab tests, and some medical equipment.
Part D (Prescription Drug Coverage): Optional Medicare coverage that helps pay for prescription drugs. It is offered through private insurance companies as stand-alone drug plans or built into many Medicare Advantage plans.
Premium: The amount you pay, usually each month, to have Medicare Part B, a Part D plan, a Medicare Advantage plan, or a Medigap policy.
Primary Care Provider (PCP): The main doctor or clinic you see for routine care and checkups. Some Medicare Advantage plans require you to choose a PCP and get referrals for specialists.
Prior Authorization: A rule that requires your doctor or provider to get approval from your plan before certain services, procedures, or drugs will be covered.
Qualifying Life Event: A change in your situation, such as moving, losing other coverage, or qualifying for Extra Help, that may allow you to change your Medicare coverage outside of the usual enrollment periods.
Referral: A written order from your primary care provider that allows you to see a specialist or get certain services. Some Medicare Advantage plans require referrals for coverage.
Service Area: The geographic area where a Medicare Advantage or Part D plan is offered and where you must live to enroll and stay in the plan.
Skilled Nursing Facility (SNF): A facility that provides skilled nursing care and rehabilitation services after a hospital stay, when you need more care than you can get at home but do not need full hospital care.
Special Enrollment Period (SEP): A window of time outside of the usual enrollment periods when you can sign up for or change Medicare coverage because of certain life events, such as moving or losing employer coverage.
Step Therapy: A rule in some drug plans that requires you to try one or more lower-cost drugs before the plan will cover a more expensive drug.
Tier: A level in a drug plan’s formulary that groups drugs by cost. Lower tiers usually have lower copays, while higher tiers often have higher copays or coinsurance.
Urgent Care: Care you receive for a sudden illness or minor injury that needs quick attention but is not a life-threatening emergency.
Waiting Period: A set amount of time you may have to wait before certain coverage starts or before a pre-existing condition is covered under some types of plans.
Medicare language can feel overwhelming, even with a glossary in front of you. If a term is still confusing, or if you are not sure how it applies to your situation, you do not have to figure it out alone.
Steven is here to walk through your questions in plain language and help you understand how your options fit your health needs and budget. There is never a fee for our guidance.
You can call the office at call or text, 303-875-8891, or use the contact form to request a no-cost conversation.