
Medicare is the federal health insurance program for US citizens aged 65 or older and younger people with disabilities. It was established in 1965 and is now administered by the Centers for Medicare and Medicaid Services (CMS). Medicare is divided into four parts: A, B, C, and D. Part A covers hospital, skilled nursing, and hospice services, while Part B covers outpatient services. Part C, also known as Medicare Advantage, is an alternative that allows patients to choose private plans with different benefit structures. Part D covers prescription medications. When you have Medicare and other health insurance, one will be the primary payer and the other will be the secondary payer. Medicare Advantage Plans are highly concentrated, with most Americans living in counties where one or two insurers dominate.
| Characteristics | Values |
|---|---|
| Who is eligible for Medicare? | Individuals over 65 years of age or those with certain disabilities, including End-Stage Renal Disease (ESRD) and amyotrophic lateral sclerosis (ALS or Lou Gehrig's disease). |
| What are the different parts of Medicare? | Part A (Hospital Insurance), Part B (Medical Insurance), Part C (Medicare Advantage), and Part D (Prescription Drug Coverage). |
| How does Medicare work with other insurance? | Medicare is primary or secondary insurance depending on various factors, including age, type of insurance, and special situations. Individuals can also purchase supplemental coverage, such as Medicare Supplement Insurance (Medigap) or private insurance, to help cover additional costs. |
| How to sign up for Medicare? | Individuals can sign up for Medicare during specific times. They can choose between Original Medicare (Parts A and B) and Medicare Advantage (Part C) plans. Part D drug coverage can be added separately or is often included in Medicare Advantage plans. |
| Cost considerations | Medicare covers about half of the healthcare expenses of those enrolled. Enrollees can expect to pay premiums, deductibles, co-pays, and costs for services not covered by Medicare, such as long-term custodial care. |
| Provider options | With Original Medicare, individuals can see any doctor or hospital that accepts Medicare nationwide. Medicare Advantage plans typically require individuals to use doctors within the plan's network. |
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What You'll Learn

Medicare Part A and Part B
Medicare is the federal health insurance program for people aged 65 and over in the US. Those under 65 may be eligible for Medicare if they have a disability, End-Stage Renal Disease (ESRD), or ALS (Lou Gehrig's Disease).
Medicare Part A is insurance for inpatient care in hospitals, skilled nursing facility care, hospice care, and home health care. Most people get Part A for free, but some have to pay a premium for this coverage. To be eligible for premium-free Part A, an individual must be entitled to receive Medicare based on their own earnings or those of a spouse, parent, or child. To receive premium-free Part A, the worker must have a specified number of quarters of coverage (QCs) and file an application for Social Security or Railroad Retirement Board (RRB) benefits.
Medicare Part B is medical insurance. To receive Part A and Part B, one must be enrolled in or eligible for Social Security disability benefits. Individuals with Lou Gehrig's Disease (ALS) will receive Medicare Parts A and B immediately upon enrolling in Social Security disability benefits. Those with End-Stage Renal Disease (ESRD) may also be eligible for Medicare coverage.
Original Medicare includes Part A and Part B. Medicare Advantage (Part C) is an alternative to Parts A and B that bundles several coverage types, including Parts A, B, and usually Part D. Medicare Advantage is a Medicare-approved plan from a private company that offers an alternative to Original Medicare for health and drug coverage. These "bundled" plans include Part A, Part B, and usually Part D. In many cases, you can only use doctors who are in the plan's network. Plans often have different out-of-pocket costs than Original Medicare or supplemental coverage.
Medicare Part D helps cover the cost of prescription drugs, including recommended shots or vaccines. You can join a separate Medicare drug plan in addition to Original Medicare or get it by joining a Medicare Advantage Plan with drug coverage.
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Medicare Advantage Plans
Before joining a Medicare Advantage Plan, it's essential to talk to your employer, union, or benefits administrator about their rules. Joining one of these plans might cause you to lose your current coverage, and you may not be able to get it back.
Each Medicare Advantage Plan can have different rules for how you access services, such as requiring referrals to see a specialist. Costs for monthly premiums and services vary depending on the specific plan you choose. It's important to carefully review the details of each plan before making a decision to ensure it meets your healthcare needs and budget.
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Medicare Supplement Insurance (Medigap)
Medicare Supplement Insurance, also known as Medigap, is extra insurance provided by private health insurance companies. It helps pay for out-of-pocket costs in Original Medicare (Part A and Part B). Original Medicare includes Part A (Hospital Insurance) and Part B (Medical Insurance). Part A covers hospitalisation, home or skilled nursing, and hospice, while Part B covers medical insurance.
Medigap policies help lower your share of costs for services received under Original Medicare. These policies are standardised, and in most states, they are named by letters like Plan G or Plan K. The benefits offered by each lettered plan are the same, regardless of the insurance company.
You can choose to purchase a Medigap policy if you already have Original Medicare. Medigap policies are not available for those with Medicare Advantage Plans, which are bundled plans that typically include Part A, Part B, and sometimes Part D (prescription drug coverage). Medicare Advantage Plans are offered by private companies and may provide extra benefits not covered by Original Medicare, such as vision, hearing, and dental services.
When considering Medigap, it's important to note that you must generally have both Part A and Part B of Original Medicare to be eligible for a Medigap policy. Additionally, Medigap policies do not cover prescription drug costs; for that, you would need to enrol in Part D separately or through a Medicare Advantage Plan that includes it.
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Medicare eligibility
Medicare is the federal health insurance program for people aged 65 and over. If you are under 65, you may still be eligible for Medicare if you have a disability, End-Stage Renal Disease (ESRD), or ALS (Lou Gehrig's Disease).
There are a few ways to be eligible for Medicare. Some people get Medicare automatically, while others have to sign up. If you are already receiving Social Security benefits before you turn 65, you will be automatically enrolled in Medicare Parts A and B after 24 months. If you have Lou Gehrig's Disease (ALS), you will receive Medicare Parts A and B immediately when you enrol in Social Security disability benefits. If you have ESRD, you will need to contact your Social Security Office to apply for Medicare.
If you are not yet receiving Social Security benefits at 65 because you are still working, you can apply online for Medicare only. You may also be able to wait until you retire and sign up during a special enrolment period.
Medicare has four parts: Part A, Part B, Part C, and Part D. Part A covers hospitalisation, home or skilled nursing, and hospice. Most people don't pay a premium for Part A coverage, but if you don't qualify for premium-free Part A, you might be able to buy it. Part B covers medical insurance, and you will pay a premium for this coverage every month. Part C, also known as Medicare Advantage, is a private insurance option that covers hospital and medical costs. Part D covers prescription medications.
Medicare Advantage Plans are an alternative to Original Medicare, which includes Parts A and B. These plans are offered by private companies and usually include Parts A, B, and D. They may also offer extra benefits that Original Medicare doesn't cover, like vision, hearing, and dental services.
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Medicare costs
Medicare is the federal health insurance program for people aged 65 and over in the US. If you are under 65, you may be eligible for Medicare earlier if you have a disability, End-Stage Renal Disease (ESRD), or ALS (Lou Gehrig's Disease).
Medicare is made up of several parts, each covering different healthcare needs and costs. Here is a breakdown of the costs associated with each part:
Part A (Hospital Insurance)
Part A covers hospitalization, home or skilled nursing, and hospice care. Most people do not have to pay a premium for Part A because they have already paid Medicare taxes while working. However, if you don't meet certain requirements, you may have to pay a monthly premium for this coverage.
Part B (Medical Insurance)
Part B covers medical services such as doctor visits, outpatient care, and preventive services. Almost everyone has to pay a monthly premium for Part B coverage. The standard monthly premium for Part B in 2023 is $164.90, but this amount may vary depending on your income and the timing of your enrollment.
Part C (Medicare Advantage Plans)
Part C, also known as Medicare Advantage, is offered by private insurance companies as an alternative to Original Medicare (Part A and Part B). These plans typically have different out-of-pocket costs than Original Medicare and may include an additional premium. The cost of Part C plans varies depending on the specific plan chosen.
Part D (Prescription Drug Coverage)
Part D helps cover the cost of prescription medications, including many recommended shots or vaccines. You can join a separate Medicare drug plan, or get Part D coverage through a Medicare Advantage Plan that includes prescription drug coverage. The cost of Part D plans can vary, and you may need to pay a late enrollment penalty if you did not sign up when you were first eligible.
Supplemental Coverage (Medigap)
Medigap is supplemental insurance that helps to lower your share of costs for services covered by Original Medicare. These plans are standardized and named by letters, like Plan G or Plan K. The benefits offered by each lettered plan are the same, regardless of the insurance company. Medigap policies typically have their own costs, which you pay in addition to your Original Medicare premiums.
It's important to note that Medicare costs can vary based on factors such as income, age, and the specific plan chosen. Additionally, there may be other programs or sources of assistance to help with Medicare costs, such as state programs for those with limited incomes.
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Frequently asked questions
Medicare is the federal health insurance program for people who are 65 or older. Younger people with disabilities, including those with End-Stage Renal Disease and amyotrophic lateral sclerosis (ALS or Lou Gehrig's disease), are also eligible. Medicare is divided into four parts: A, B, C, and D. Part A covers hospital, skilled nursing, and hospice services. Part B covers medical insurance or outpatient services. Part D covers prescription drugs. Part C, also known as Medicare Advantage, is an alternative that allows patients to choose private plans with different benefit structures that provide the same services as Parts A and B, usually with additional benefits.
Individuals who are 65 years old and eligible for Social Security or Railroad Retirement benefits are automatically eligible for Medicare Part A. You can sign up for Part A and Part B at certain times of the year. You can sign up for Medicare only if you are still working at 65 and not ready to receive Social Security benefits. If you have Lou Gehrig's disease (ALS), you will receive Medicare Parts A and B immediately when you enroll in Social Security disability benefits.
Medicare Advantage, or Part C, is a Medicare-approved plan from a private company that offers an alternative to Original Medicare for health and drug coverage. These \"bundled\" plans include Part A, Part B, and usually Part D. In many cases, you must have both Part A and Part B to join a Medicare Advantage Plan.
Medicare Supplement Insurance, or Medigap, is extra insurance you can buy from a private company to help pay your share of costs in Original Medicare. Medigap policies do not cover long-term care, vision, dental, hearing aids, private-duty nursing, or prescription drugs. Generally, you need Part A and Part B to buy a Medigap policy.



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