We are here to assist you.
Health Advisor
+91-8877772277Available 7 days a week
10:00 AM – 6:00 PM to support you with urgent concerns and guide you toward the right care.
Demystify Medicare Open Enrollment with our comprehensive glossary. Understand key terms like premiums, deductibles, Medigap, and Medicare Advantage to make informed decisions about your health coverage for the upcoming year.

Understand Medicare Part C (Medicare Advantage): what it covers, different plan types (HMO, PPO), costs, and how to choose the best plan for your needs. Get comprehensive health coverage beyond Original Medicare.
April 1, 2026

Learn how Medicare covers cataract surgery in India. Understand costs, types of surgery, what Medicare Parts A, B, C, and D cover, and potential out-of-pocket expenses for seniors.
April 1, 2026

Medicare Open Enrollment is a crucial time for millions of Americans to review and adjust their health coverage for the upcoming year. For many, navigating the complex world of Medicare can feel overwhelming, filled with unfamiliar terms and acronyms. Making informed decisions during this period is vital to ensure you have the right healthcare coverage that fits your needs and budget.
This comprehensive glossary is designed to be your essential guide, breaking down key Medicare terms into clear, understandable language. Whether you're new to Medicare or a seasoned beneficiary looking to optimize your plan, understanding these definitions will empower you to confidently choose the best options during Open Enrollment.
Medicare is the federal health insurance program for people who are 65 or older, certain younger people with disabilities, and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant).
The Medicare Open Enrollment Period, also known as the Annual Election Period (AEP), is the time each year when Medicare beneficiaries can make changes to their Medicare health plans and prescription drug coverage. It typically runs from October 15 to December 7, with new coverage taking effect on January 1 of the following year. During this period, you can:
Part A covers inpatient hospital stays, care in a skilled nursing facility, hospice care, and some home health care. Most people don't pay a monthly premium for Part A if they or their spouse paid Medicare taxes through employment for a specified period.
Part B covers certain doctors' services, outpatient care, medical supplies, and preventive services. Most people pay a monthly premium for Part B, which is often deducted directly from their Social Security benefits.
Medicare Advantage Plans are offered by private companies approved by Medicare. They provide all your Part A and Part B benefits and often include Part D (prescription drug coverage). Many plans also offer extra benefits not covered by Original Medicare, such as vision, hearing, and dental services. When you join a Medicare Advantage Plan, you're still in Medicare.
Part D adds prescription drug coverage to Original Medicare, some Medicare Cost Plans, some Medicare Private Fee-for-Service Plans, and Medicare Medical Savings Account Plans. These plans are offered by private companies approved by Medicare. You must join a plan to get Part D coverage.
A premium is the monthly amount you pay to an insurance plan for coverage. You might pay a premium for Part B, Part D, Medicare Advantage, or Medigap plans.
A deductible is the amount you must pay for healthcare services or drugs before your insurance plan starts to pay. For example, if your plan has a $200 deductible, you pay the first $200 of covered services yourself.
A copayment is a fixed amount you pay for a covered healthcare service after you've paid your deductible. For example, you might pay a $20 copay for a doctor's visit.
Coinsurance is your share of the cost of a covered healthcare service, calculated as a percentage of the allowed amount for the service. For example, if your coinsurance is 20%, you pay 20% of the cost, and your plan pays 80%.
This is the most you have to pay for covered services in a plan year before your plan starts to pay 100% of the allowed amount for covered services. This limit applies to Medicare Advantage Plans, but not to Original Medicare.
A formulary is a list of prescription drugs covered by a Part D plan or a Medicare Advantage Plan with prescription drug coverage. Plans typically group drugs into different tiers, with varying costs.
A network refers to the group of doctors, hospitals, and other healthcare providers that an insurance plan has contracted with to provide services to its members at a discounted rate. Common types include:
A referral is an order from your primary care doctor for you to see a specialist or get certain medical services. HMO plans often require referrals, while PPO plans typically do not.
A Special Enrollment Period is a time outside of the Initial Enrollment Period and the Annual Election Period when you can sign up for Medicare or make changes to your existing Medicare health or drug plan. SEPs are granted for specific life events, such as moving to a new area, losing other health coverage, or qualifying for Extra Help.
Your Initial Enrollment Period is the 7-month period when you can first sign up for Medicare. It begins 3 months before you turn 65, includes the month you turn 65, and ends 3 months after you turn 65.
If you miss your Initial Enrollment Period and you don't qualify for a Special Enrollment Period, you can sign up for Part A and/or Part B during the General Enrollment Period, which runs from January 1 to March 31 each year. Coverage starts July 1, and you may have to pay a late enrollment penalty.
Guaranteed issue rights (also called Medigap protections) are rights you have in certain situations when insurance companies must offer you certain Medigap policies. In these situations, an insurance company can't refuse to sell you a Medigap policy, charge you more due to health conditions, or make you wait for coverage to start.
Medigap policies are sold by private companies and can help pay some of the healthcare costs that Original Medicare doesn't cover, like copayments, coinsurance, and deductibles. Some Medigap policies also cover services that Original Medicare doesn't, such as medical care when you travel outside the U.S.
Original Medicare refers to Part A (Hospital Insurance) and Part B (Medical Insurance) provided directly by the federal government.
It's important to understand that you cannot have a Medicare Advantage Plan and a Medigap policy at the same time. If you have Original Medicare, you can add a Medigap policy and/or a Part D plan. If you have a Medicare Advantage Plan, your benefits come from the private plan, not Original Medicare, and Medigap policies cannot supplement Medicare Advantage Plans.
Creditable coverage refers to prior health insurance coverage that meets Medicare's minimum standards. If you had creditable prescription drug coverage before enrolling in Part D, you may avoid late enrollment penalties.
If you don't sign up for Part B or Part D when you're first eligible and don't have other creditable coverage, you may have to pay a late enrollment penalty for as long as you have Medicare. These penalties can increase your premiums significantly.
IRMAA is an extra amount you may have to pay for your Part B and Part D premiums if your income is above a certain level. Medicare uses your tax return from two years prior to determine if you owe IRMAA.
Preventive services are healthcare services like screenings, shots, and certain check-ups that help prevent illness or detect problems early, when treatment is most effective. Many preventive services are covered 100% by Medicare.
The Medicare Summary Notice (MSN) is a statement that Original Medicare beneficiaries receive every three months. It lists all the services and supplies that doctors and suppliers have billed to Medicare, what Medicare paid, and the amount you may owe.
Extra Help is a Medicare program to help people with limited income and resources pay for Medicare prescription drug costs, including premiums, deductibles, and coinsurance. It significantly reduces the cost of Part D coverage.
Now that you have a better understanding of these key terms, here are some tips to make the most of Open Enrollment:
A: Medicare Advantage Plans (Part C) replace Original Medicare and are offered by private companies, often including Part D and extra benefits. Medigap policies supplement Original Medicare by helping pay for out-of-pocket costs like deductibles and copayments; you cannot have both a Medicare Advantage Plan and a Medigap policy simultaneously.
A: Generally, no. Changes to your Medicare Advantage or Part D plan can primarily be made during the Annual Election Period (Open Enrollment) from October 15 to December 7, or during a Special Enrollment Period if you qualify due to specific life events.
A: If you miss Open Enrollment and don't qualify for a Special Enrollment Period, you generally won't be able to make changes to your Medicare Advantage or Part D plan until the next Open Enrollment period. This could mean being stuck with a plan that no longer meets your needs or paying higher costs. For Original Medicare Parts A and B, if you missed your Initial Enrollment Period, you might be able to enroll during the General Enrollment Period (January 1 to March 31), but late enrollment penalties may apply.
A: You can typically check a plan's provider directory on its website, or by calling the plan directly. You can also ask your doctor's office if they accept a specific Medicare Advantage Plan or if they accept Medicare assignment (for Original Medicare).
A: You can visit Medicare.gov, call 1-800-MEDICARE, or contact your State Health Insurance Assistance Program (SHIP) for free, unbiased counseling. Licensed insurance agents can also provide information on specific plans they offer.
Navigating Medicare Open Enrollment doesn't have to be a daunting task. By familiarizing yourself with the essential terms and concepts outlined in this glossary, you can approach the process with confidence and clarity. Understanding the differences between Medicare Parts, the implications of various costs, and the options available to you is the first step towards securing the best possible healthcare coverage for your needs. Take the time to review your options, ask questions, and make informed decisions that will support your health and well-being in the year ahead.
Understand Medicare's coverage for dental care. Learn about Original Medicare limitations, Medicare Advantage options, and alternative solutions for seniors in India to maintain oral health.
April 1, 2026