Learn About Medicare and SSDI Programs

What Medicare Is and How It Works

Medicare is a federal health insurance program run by the Centers for Medicare & Medicaid Services (CMS), a division of the U.S. Department of Health and Human Services. The program began in 1965 and currently covers more than 66 million people across the United States. Medicare provides health insurance coverage to people age 65 and older, some younger people with disabilities, and people with end-stage renal disease or ALS (also called Lou Gehrig's disease).

The program is divided into four main parts, each covering different types of medical services. Part A covers hospital stays, including inpatient hospital care, skilled nursing facility care, hospice care, and some home health services. Part B covers outpatient medical services, such as doctor visits, outpatient surgery, diagnostic tests, and preventive care services. Part D covers prescription medications through approved private insurance companies. Part C, also called Medicare Advantage, is an alternative way to receive Parts A and B benefits through a private insurance company that contracts with Medicare.

Medicare is funded through multiple sources. Workers and employers pay a payroll tax of 2.9% (split equally, so each pays 1.45%) on all wages. People with higher incomes pay an additional 0.9% tax. Self-employed people pay the full 2.9% plus the additional tax if their income exceeds certain thresholds. General tax revenue also funds the program. These funds go into trust accounts for different parts of Medicare.

Understanding Medicare's structure matters because the coverage, costs, and rules differ between parts. A person might have Part A and B through Original Medicare (sometimes called Traditional Medicare) while also choosing a Part D plan for prescriptions, or they might choose a Medicare Advantage plan that combines Parts A, B, and usually D into one plan offered by a private insurer. Each choice affects what hospitals and doctors are in-network, what out-of-pocket costs apply, and how prescriptions are covered.

Practical Takeaway: Medicare has four distinct parts with different coverage areas. Learning which parts cover what services helps you understand what to expect from your coverage and what out-of-pocket costs might apply to different types of care.

Medicare Parts A, B, C, and D Explained

Part A is hospital insurance. It covers inpatient hospital stays, meaning when you are admitted to a hospital as a registered patient. If you stay in a skilled nursing facility after a hospital stay (a facility providing specialized medical care beyond what you can receive at home), Part A covers up to 100 days under certain conditions. Part A also covers some home health services when ordered by a doctor, and hospice care for people with terminal illnesses. In 2024, if you are hospitalized, you pay a deductible of $1,632 for each benefit period. After you meet that deductible, you pay nothing for the first 60 days of hospitalization, then $408 per day for days 61-90, and $816 per day for days 91-150. Days beyond 150 are not covered by Part A.

Part B is medical insurance that covers doctor services, outpatient hospital care, and medical equipment and supplies. This includes office visits, emergency room visits, lab tests, X-rays, mental health services, and physical therapy. Part B also covers preventive services with no out-of-pocket cost, such as annual wellness visits, cancer screenings, cardiovascular screenings, and immunizations. Most people pay a monthly premium for Part B. In 2024, the standard monthly premium is $174.70 for people with incomes at or below $97,000 per year. People with higher incomes pay higher premiums. You also pay a yearly deductible of $240, and then you pay 20% of approved charges after the deductible is met, with no yearly limit on what you might owe out-of-pocket.

Part C is Medicare Advantage, offered by private insurance companies approved by Medicare. These plans contract with Medicare to provide coverage for Parts A and B, and most include Part D (prescription drug coverage) as well. Medicare Advantage plans often have lower or $0 monthly premiums compared to Original Medicare plus supplemental insurance, but they typically have different provider networks, meaning you may have a limited choice of doctors and hospitals. Out-of-pocket costs can be lower in some cases, but plans vary widely. Some offer dental, vision, or hearing coverage that Original Medicare does not cover. However, if you need medical care outside your plan's service area, you may not be covered, which matters if you travel frequently.

Part D covers prescription medications through stand-alone prescription drug plans if you have Original Medicare (Parts A and B), or through a Medicare Advantage plan that includes drug coverage. There are hundreds of Part D plans available, and they differ in which medications they cover, how much you pay, and which pharmacies participate. Each plan has a formulary, which is the list of covered drugs. Plans are required to cover at least two drugs in each therapeutic category, but they do not have to cover every medication. If your doctor prescribes a medication not on your plan's formulary, you may need to pay out-of-pocket, request an exception, or switch to a different plan.

Practical Takeaway: Each Medicare part covers different services with different costs. Part A covers hospitals, Part B covers doctors and outpatient care, Part C bundles A and B through a private insurer, and Part D covers prescriptions. Knowing what each part covers helps you understand what costs to expect for specific medical services.

SSDI: Social Security Disability Insurance Basics

Social Security Disability Insurance (SSDI) is a federal program that provides monthly income and healthcare coverage to working-age people (including children in some cases) who have a medical condition that prevents them from working. The program is run by the Social Security Administration (SSA). As of 2024, approximately 7.7 million people receive SSDI benefits.

To understand SSDI, it helps to know that Social Security has two main disability programs. SSDI is one of them. The other is Supplemental Security Income (SSI), which is a needs-based program for people with low income and limited resources. The key difference is that SSDI is based on your work history and the payroll taxes you or a family member paid into Social Security. SSI does not require a work history and is based on financial need. A person might receive one, both, or neither depending on their situation.

SSDI provides monthly cash benefits to you and, in some cases, to family members. The amount you receive is based on your Social Security earnings record—specifically, the average income you had over your working years. In 2024, the average SSDI payment is approximately $1,550 per month, though individual amounts vary. If you have worked and contributed to Social Security, a higher lifetime income typically means a higher benefit amount. Family members who may receive benefits based on your work record include your spouse at age 62 or older, your spouse of any age caring for a child under 16, and your unmarried children under 19 (or 22 if a full-time student), or adult children who became disabled before age 22.

SSDI also provides healthcare coverage. When you begin receiving SSDI, you automatically become covered by Medicare after 24 consecutive months of receiving benefits. This is a significant feature because many working-age people without SSDI do not have access to affordable health insurance. The Medicare coverage works the same way as for people age 65 and older, with Parts A, B, C, and D available. Some people receiving SSDI also receive Medicaid (state medical assistance) during the 24-month waiting period, depending on their state and income level.

Practical Takeaway: SSDI provides monthly income based on your work history and automatic access to Medicare after 24 months. Understanding this connection between income and healthcare coverage helps you see the full picture of what SSDI provides.

How Medical Conditions Are Evaluated for SSDI

The Social Security Administration maintains a list of medical conditions that, if severe enough, automatically meet the standards for SSDI. This list is called the Blue Book, and it includes over 14,000 medical conditions and body systems. Conditions range from cancer to arthritis to mental health disorders to neurological diseases. The Blue Book is organized by body system, and each condition has specific criteria that must be met.

For a condition to meet SSDI standards, it must prevent you from working for at least 12 months, result in death, or be a terminal