How do I choose between different Medicare Supplement plans for a parent needing predictable copays?

If your parent wants predictable costs, the key is to compare how much they’ll pay out of pocket under each Medicare Supplement (Medigap) plan, not just the monthly premium.

1) Know what Medigap can and can’t do

Medicare Supplement plans help cover some costs from Original Medicare (Part A + Part B), such as:

• deductibles
• coinsurance
• copays
• excess charges (in some plans)

They generally don’t work like a Medicare Advantage plan:

• no provider networks to manage
• usually no built-in drug coverage
• you still use Original Medicare for care

For predictable copays, Medigap can help, but most plans are more about reducing unexpected bills than giving flat copays for everything.

2) Focus on the plans most relevant for predictability

For many people, these are the main choices:

Plan G

• Very popular
• Covers almost everything Original Medicare doesn’t, except the Part B deductible
• Usually one of the best choices for predictability
• You’ll pay:
  • monthly premium
  • Part B deductible
  • very little else for Medicare-covered services

Plan N

• Lower premium than Plan G in many areas
• Typically includes:
  • copays for some doctor visits and ER visits
  • no coverage for Part B excess charges
• Good if your parent doesn’t mind a few small copays in exchange for a lower premium

Plan K or L

• Lower premiums
• More cost-sharing and annual out-of-pocket limits
• Less predictable than G or N unless budget is the main concern

Plan F

• Covers nearly everything, including the Part B deductible
• Only available if your parent became Medicare-eligible before 2020
• Often has higher premiums; not always the best value

3) For predictable copays, compare “premium + expected usage”

A plan with a low premium may still cost more overall if your parent uses care often.

Ask:

• How many primary care visits per year?
• Specialist visits?
• Physical therapy?
• ER or urgent care use?
• Frequent lab work or imaging?

Then estimate: monthly premium x 12 + expected copays + deductible

Simple rule of thumb

• Frequent care / want maximum predictability: Plan G is often the easiest to budget for
• Moderate care / okay with small copays: Plan N may save money
• Low care use / focused on low premium: consider lower-premium plans, but total costs may be less predictable

4) Check the “doctor accept Medicare” issue

Medigap works best if the parent’s doctors:

• accept Original Medicare
• do not require Medicare Advantage network rules

If their doctors accept Medicare, Medigap is usually straightforward.

5) Consider prescription drug coverage separately

Medigap does not usually include drug coverage. They’ll likely need a Part D plan for medications.

When comparing plans, include:

• Medigap premium
• Part D premium
• drug copays/formulary
• dental/vision/hearing if important, since Medigap usually doesn’t cover these

6) Watch for underwriting and enrollment timing

The best time to buy a Medigap plan is during the Medigap Open Enrollment Period:

• starts when Part B starts
• lasts 6 months
• no medical underwriting in most cases

If outside that window, they may need to answer health questions, and approval isn’t guaranteed.

7) A practical way to decide

If the goal is predictable out-of-pocket costs:

• Choose Plan G if you want the simplest, most predictable setup
• Choose Plan N if you want a lower premium and can tolerate small copays
• Avoid choosing based only on premium; compare total yearly cost

8) Questions to ask before deciding

• What is the monthly premium?
• What is the Part B deductible?
• Are there copays for office visits or ER?
• Does the plan cover Part B excess charges?
• What is the estimated yearly total cost based on their current health care use?
• Can they keep their doctors?

If you want, I can help you compare Plan G vs Plan N vs Plan F for a specific parent’s situation and show a simple yearly cost estimate.