What is the difference between Medigap and Medicare Advantage?

Quick Answer

Medigap is a supplement that works alongside Original Medicare to cover costs like copays and deductibles. Medicare Advantage replaces Original Medicare entirely with a private plan that bundles your coverage, often with extras, but usually within a provider network.

Detailed Explanation

These two options solve different problems, and you cannot have both at the same time.Medigap, sometimes called Medicare Supplement insurance, sits on top of Original Medicare. You keep Parts A and B, and Medigap picks up some or all of the costs Original Medicare leaves behind, things like your 20 percent share of doctor bills or hospital deductibles. You still see any doctor who accepts Medicare, anywhere in the country. Most Medigap plans have a predictable monthly premium, which makes budgeting easier, but you will also still pay your Part B premium on top of that. Medigap does not include prescription drug coverage, so you would need a separate Part D plan.Medicare Advantage replaces Original Medicare with a private plan. Instead of paying Medicare directly, you use your Advantage plan for everything. These plans usually include prescription drug coverage and often add dental, vision, or fitness benefits. Many have low or even zero monthly premiums beyond your Part B premium, but your costs can vary more depending on how much care you use. You are also generally limited to the plan's network of doctors.Medigap tends to suit people who want predictable costs and full flexibility on providers. Medicare Advantage can work well for people who want extra benefits and are comfortable staying within a network. Plan details vary, so comparing current options is important.

How This Applies in Utah

In Utah, Medigap plans are sold by carriers like Regence BlueCross, SelectHealth, and others. If you rely on both Intermountain Health and University of Utah Health providers, a Medigap plan with Original Medicare may give you the most flexibility since you are not locked into one health system's network.

What This Means For You

For you, this means Medigap prioritizes predictability and access, while Medicare Advantage prioritizes bundled benefits and potentially lower upfront costs, and the tradeoffs are real enough that it is worth talking through your specific situation with someone who knows both options.

Disclaimer

‍How Resting Sycamore Advisors Uses CMS Data

Our Commitment to Reliable Medicare Information

At Resting Sycamore Advisors, we work to provide accurate, current, and trustworthy information about Medicare Advantage, Medicare Part D, and Special Needs Plans.

To do that, we use data published by the Centers for Medicare & Medicaid Services (CMS), which is the official source for Medicare plan and enrollment information.

CMS Data Sources We Rely On

Our Medicare plan pages and comparison tools are powered by CMS datasets, including:

  • Medicare Advantage and Part D Landscape Files for annual plan availability and benefit details
  • Plan Benefits Package (PBP) Files for detailed benefit and coverage information
  • Part C and Part D Performance Data for quality ratings and plan performance measures
  • Monthly Enrollment Data for enrollment counts by contract, plan, state, and county

When possible, we link to the original CMS resources so you can review the source material directly.

How Often We Update Our Data

We follow the CMS release schedule and update our website as new data becomes available.

Annual Plan Year Updates (September)

We load new plan year Landscape and PBP files before the Medicare Annual Enrollment Period (October 15 through December 7). We also monitor CMS.gov for updates or revisions and refresh our content when needed.

Mid-Year Updates

We update enrollment and performance data as CMS publishes revised files, which are typically released monthly or quarterly.

Ongoing Maintenance

We routinely monitor CMS announcements for corrections, reissued files, or other changes and update our pages accordingly.

Each plan page includes a Last Accessed date so visitors can see when the source information was most recently reviewed.

How We Prepare CMS Data for Our Website

CMS data can be difficult to read in raw form. To make it easier to use, we format and organize the data for clarity.

This includes:

  • Standardizing plan identifiers such as contract ID, plan ID, and segment
  • Normalizing terminology so common Medicare terms are presented consistently
  • Organizing plan information by state, county, and ZIP code to match how people shop for coverage

All data values come from CMS. We do not change the underlying values beyond formatting, organization, and presentation.

Version Tracking and Transparency

We keep internal records of the CMS dataset versions used on our site.

Major Version History

  • Current Version: CY2025 Medicare Advantage and Part D Landscape Files (v1.0, published October 2025)
  • Prior Version: None. Resting Sycamore Advisors first began publishing structured Medicare plan information in March 2025

If CMS issues corrected or revised files, we update our website to reflect the latest available version.

Important Limitations

Please keep the following in mind:

  • CMS is the official source of truth. For enrollment and coverage decisions, always confirm details with Medicare.gov or 1-800-MEDICARE.
  • Data timing can vary. Enrollment and performance updates may appear on our website a few weeks after CMS publishes changes.
  • Plan details can change. Plan availability, costs, and benefits may change. Always verify current details directly with the plan provider.

Need Help From Official Medicare Resources?

For personalized Medicare assistance, please use these official resources:

  • Medicare.gov Help Center — https://www.medicare.gov
  • 1-800-MEDICARE (1-800-633-4227) TTY: 1-877-486-2048
  • State Health Insurance Assistance Program (SHIP) — free local counseling for Medicare beneficiariesIf you want, I can also give you a shorter legal-style version for a footer or /disclaimer page summary.