Discover what services the Medicare program provides through Parts A, B, C, and D. Learn hospital coverage, medical services, prescription drugs, and who administers Medicare.
What the Medicare Program Provides?
The Medicare program, established in 1965 under Title XVIII of the Social Security Act, provides comprehensive health insurance coverage for Americans aged 65 and older, certain younger individuals with disabilities, and people with End-Stage Renal Disease. The program was created to solve the critical problem of healthcare access and affordability for seniors who often faced financial hardship from medical expenses.
Medicare is administered by the Centers for Medicare & Medicaid Services, a federal agency within the Department of Health and Human Services. Moreover, the Social Security Administration handles enrollment and premium collection. This federal legislation enacted both Medicare and Medicaid programs simultaneously, creating an interconnected safety net for healthcare coverage across different populations.
How Many Parts Is the Medicare Program Divided Into?
The Medicare program is divided into four distinct parts, each addressing specific healthcare needs and services.
The Four Parts of Medicare:
- Part A: Hospital Insurance covering inpatient care
- Part B: Medical Insurance covering outpatient services
- Part C: Medicare Advantage offering alternative coverage
- Part D: Prescription Drug Coverage
These four parts work together to provide comprehensive healthcare coverage. Furthermore, understanding each part helps beneficiaries make informed decisions about their healthcare needs.
What Does Medicare Part A Provide?
Medicare Part A, also known as Hospital Insurance, covers inpatient hospital care and related services. Most people receive it premium-free.
Part A Coverage Includes:
- Inpatient Hospital Care: Semi-private room, nursing services, meals, and medical supplies
- Skilled Nursing Facility: Up to 100 days per benefit period following qualifying 3-day hospital stay
- Home Health Care: Part-time skilled nursing, physical therapy, and occupational therapy
- Hospice Care: Pain relief, symptom management, and counseling for terminal illnesses
The Medicare hospital insurance coverage details provide comprehensive information about Part A benefits.
What Does Medicare Part B Provide?
Medicare Part B covers medically necessary doctor services, outpatient care, and preventive services.
Part B Coverage Includes:
- Doctor Services: Primary care, specialist visits, and outpatient surgery
- Preventive Services: Annual wellness visits, screening tests, vaccinations, and counseling
- Outpatient Care: Emergency room services, ambulance transportation, diagnostic tests
- Medical Equipment: Durable medical equipment like wheelchairs and oxygen
- Additional Services: Therapy services, dialysis, and limited outpatient prescription drugs
Understanding Medicare medical insurance benefits helps beneficiaries maximize coverage and minimize out-of-pocket costs.
What Is Medicare Part C (Medicare Advantage)?
Medicare Part C, known as Medicare Advantage, represents an alternative way to receive Medicare benefits through private insurance companies.
Medicare Advantage Characteristics:
- Required Coverage: All services covered by Parts A and B
- Additional Benefits: Prescription drugs, dental, vision, hearing, fitness programs
- Plan Types: HMOs, PPOs, PFFS plans, and Special Needs Plans
- Key Features: Network restrictions, annual out-of-pocket maximums, bundled coverage
Medicare Advantage plans must follow rules set by Medicare while offering flexibility in benefit delivery.
What Does Medicare Part D Provide?
Medicare Part D provides outpatient prescription drug coverage through private insurance companies.
Part D Coverage Features:
- Prescription Benefits: Generic and brand-name medications with formulary coverage
- Cost Structure: Monthly premiums, annual deductibles, copayments or coinsurance
- Protected Categories: Antidepressants, antipsychotics, anticonvulsants, immunosuppressants, cancer medications, HIV/AIDS treatments
The Medicare prescription drug coverage information explains formularies and costs. Understanding Medicare prescription drug programs helps beneficiaries navigate coverage options.
What Is Medicare FFS (Fee-for-Service)?

Medicare Fee-for-Service, commonly called Original Medicare, represents the traditional Medicare program where the government pays healthcare providers directly for services rendered.
FFS Program Characteristics:
- Freedom to see any doctor or hospital accepting Medicare nationwide
- No network restrictions or referral requirements for specialists
- Pay-as-you-go approach with services billed individually to Medicare
- Coordination with supplemental insurance like Medigap policies
- No annual out-of-pocket maximum unless supplemental coverage added
- Separate enrollment in Part D for prescription drug coverage
The fee-for-service model contrasts with Medicare ACO programs and value-based arrangements that emphasize coordinated care and quality outcomes.
Who Runs the Medicare Program?
Multiple government entities collaborate to administer the Medicare program effectively.
Government Organizations Involved:
Centers for Medicare & Medicaid Services (CMS)
- Primary administrator of all Medicare programs
- Establishes coverage policies and payment rates for providers
- Oversees Medicare Advantage and Part D plans for compliance
- Conducts quality monitoring and enforcement activities
- Sets standards for beneficiary protections
Social Security Administration (SSA)
- Handles initial Medicare enrollment for eligible individuals
- Collects Part B and Part D premiums through deduction or billing
- Determines eligibility based on work history and age
- Coordinates with Railroad Retirement Board for railroad workers
- Processes appeals related to enrollment decisions
Department of Health and Human Services
- Cabinet-level department overseeing CMS operations
- Sets overall healthcare policy direction at federal level
- Manages funds for the Medicare program through Medicare Trust Funds
- Hospital Insurance Trust Fund finances Part A benefits
- Supplementary Medical Insurance Trust Fund finances Parts B and D
Understanding Medicare versus Medicaid differences clarifies how these distinct programs serve different populations.
When Did the Medicare Program Start?

Medicare became law on July 30, 1965, when President Lyndon B. Johnson signed the Social Security Amendments creating Medicare and Medicaid. The program began providing coverage on July 1, 1966.
Historical Expansion:
- 1972: Extended to people under 65 with disabilities and ESRD
- 1997: Medicare+Choice created (later became Medicare Advantage)
- 2003: Medicare Modernization Act added Part D prescription coverage
- 2010: Affordable Care Act closed Part D coverage gap
The program continues evolving to meet changing healthcare needs while maintaining its core mission of providing accessible healthcare coverage.
Conclusion
The Medicare program provides comprehensive healthcare coverage through four distinct parts addressing hospital care, medical services, alternative coverage options, and prescription drugs. Parts A and B form Original Medicare's fee-for-service foundation, while Parts C and D offer additional coverage through private insurers.
Understanding what services the Medicare program provides enables beneficiaries to make informed decisions about their healthcare coverage. Whether choosing Original Medicare with supplemental coverage or opting for Medicare Advantage, the program offers flexibility to meet diverse healthcare needs while protecting millions of Americans from catastrophic medical expenses.
