Choosing between Original MedicareMedigap, and Medicare Advantage is one of the biggest Medicare decisions you’ll make. Each option works differently in terms of costs, doctor access, coverage, and flexibility.

Quick Overview

Feature Original Medicare Original Medicare + Medigap Medicare Advantage (Part C)
Includes Part A & B Yes Yes Yes
Prescription Drug Coverage No (buy Part D separately) No (buy Part D separately) Usually included
Doctor Choice Any doctor accepting Medicare Any doctor accepting Medicare Usually network-based
Referrals Needed No No Often yes
Out-of-Pocket Maximum No Usually very low Yes
Extra Benefits (Dental/Vision/Hearing) Usually no Usually no Often included
Monthly Premiums Lowest Highest Usually lower
Predictability of Costs Low High Moderate
Prior Authorization Rare Rare Common in many plans

Original Medicare

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Original Medicare is the federal government program that includes:

  • Part A (hospital)
  • Part B (medical)

How it works

You can see almost any doctor or hospital in the U.S. that accepts Medicare.

Medigap (Medicare Supplement)

Medigap works with Original Medicare to help pay deductibles, copays, and coinsurance.

Common plans include:

  • Plan G
  • Plan N
  • Plan K

How it works

You keep Original Medicare, then add:

  • A Medigap policy
  • Usually a separate Part D drug plan

Medicare Advantage (Part C)

Medicare Advantage is an alternative to Original Medicare offered by private insurance companies.

Most plans combine:

  • Part A

  • Part B

  • Part D (drug coverage)

Many also include:

  • Dental

  • Vision

  • Hearing

  • Fitness memberships

How it works

The insurance company manages your Medicare benefits.

Most plans are:

  • HMO

  • PPO

Biggest Difference: Flexibility vs Cost

Original Medicare + Medigap

You pay:

  • Higher monthly premiums
    But often:
  • Very low medical bills when care is needed
Medicare Advantage

You pay:

  • Lower monthly premiums
    But:
  • More pay-as-you-go costs through copays and coinsurance
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Important Long-Term Consideration

Many Medicare experts recommend carefully considering Medigap when first eligible because:

  • You usually have guaranteed enrollment rights initially
  • Switching from Medicare Advantage to Medigap later may require medical underwriting in many states
Example

Simple Real-Life Example

  • Person A
Frequent Healthcare Needs
  • Multiple specialists
  • Travels often
  • Wants predictable bills

Better fit:

  • Original Medicare + Medigap Plan G
  • Person B
Healthy and Budget-Focused
  • Rarely sees doctors
  • Wants dental and vision
  • Comfortable staying in-network

Better fit:

  • Medicare Advantage PPO or HMO

Bottom Line

If You Want… Usually Best Choice
Lowest monthly premium Medicare Advantage
Maximum doctor freedom Original Medicare + Medigap
Predictable medical costs Medigap
Extra benefits like dental Medicare Advantage
Nationwide flexibility Original Medicare + Medigap
Simplicity in one plan Medicare Advantage