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Medicare Part A, B, C and D Explained in Plain English

Diagram comparing Path 1 Original Medicare with Medigap and Part D against Path 2 bundled Medicare Advantage.
As the most significant decision you will face, choosing between Original Medicare and Medicare Advantage structures your costs and doctor access differently.

Comparing Your Coverage Paths: Original Medicare vs. Medicare Advantage

Choosing between Original Medicare and Medicare Advantage is the most significant decision you will face. Each pathway structures your costs and doctor access differently.

Comparing the Four Parts at a Glance

The comparison table below highlights the core functions, cost frameworks, and regulatory projections for each part of the Medicare system.

Medicare Part Core Function Standard 2026 Cost 2027 Outlook
Part A Inpatient hospital and skilled nursing care $0 premium (for 40 work quarters); $1,736 deductible per benefit period $1,788 projected deductible (official rate finalized mid-November)
Part B Doctor visits, outpatient care, and medical equipment $202.90 monthly premium; $283 annual deductible; 20% coinsurance $209.50 projected monthly premium; $292 projected deductible
Part C All-in-one private bundle (combines Parts A, B, and usually D) Varies by plan; mandatory annual out-of-pocket maximum Plans adjust provider networks, formularies, and copayments annually
Part D Outpatient prescription medication coverage $38.99 base premium; up to $615 deductible; $2,100 out-of-pocket cap $41.33 base premium; up to $700 deductible; $2,400 out-of-pocket cap

When evaluating these pathways, consider your travel habits, regular medications, preferred healthcare facilities, and tolerance for financial uncertainty.

Worked Example: Choosing the Right Path

Consider Robert, age 65, who manages asthma and arthritis with daily brand-name prescriptions. He lives in Ohio but spends four winter months in Florida.

If Robert chooses Medicare Advantage, he must verify whether Florida specialists participate in his plan network. Out-of-network care could generate substantial medical bills.

Instead, Robert selects Original Medicare (Parts A and B), purchases a Medigap policy, and enrolls in a standalone Part D drug plan.

This combination lets Robert see any physician nationwide who accepts Medicare. His Part D drug spending will not exceed the $2,100 out-of-pocket cap in 2026.

To evaluate plans based on your specific prescriptions, use the Medicare Plan Finder on Medicare.gov.