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What Medicare Actually Covers (and the Gaps Nobody Warns You About)

December 18, 2025 7 min read

Parts A, B, C, D, Supplements, Advantage — here's a plain-English walkthrough of what's covered, what isn't, and where people get caught off guard.

Medicare is one of the most generous benefits in the country, and also one of the most confusing. Most people turning 65 hear four letters and a handful of plan names and feel like they're being asked to pass a test they never studied for.

Here's the short version. Part A covers hospital stays. Part B covers doctors and outpatient care. Together they're 'Original Medicare' — and they leave real gaps: no out-of-pocket maximum, no routine dental or vision, and only partial coverage of many services.

You fill those gaps one of two ways. A Medicare Supplement (Medigap) plan pairs with Original Medicare and covers most of what Parts A and B don't. A Medicare Advantage plan (Part C) replaces Original Medicare with a private plan that often bundles drug coverage and extras, but uses networks.

Part D is prescription drug coverage, either standalone (with a Supplement) or built into most Advantage plans.

The gaps people get blindsided by: long-term custodial care (Medicare does not cover it), dental implants and dentures, hearing aids beyond basic exams, and care received outside your Advantage plan's network. Knowing this before you enroll changes which path makes sense for you.

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