How to Fill Medicare Coverage Gaps: Overview and Timing

Should I choose Original Medicare with Medicare Supplement Insurance and Part D, or Medicare Advantage?

These are the two Medicare coverage routes. You choose one route after Parts A and B—not both.

Quick answer

After you enroll in Parts A and B, you complete Medicare in one of two ways: keep Original Medicare and add Medicare Supplement Insurance plus a standalone Part D plan, or choose a Medicare Advantage plan. Both routes work with the benefitbay Medicare + ICHRA (CHOICE) path. The right choice depends on the care access, cost structure, prescription coverage, and flexibility you want.

Route one: Original Medicare, built up

With this route, you keep Original Medicare as your federal foundation. You add a Medicare Supplement Insurance policy to help pay your share of certain Part A and Part B costs. You add a standalone Part D plan for outpatient prescription drugs.

This route has three coverage pieces and, in most cases, three premium components: Part B, Medicare Supplement Insurance, and Part D. ICHRA (CHOICE) is set up to pay the eligible premiums through the approved benefitbay process. The appeal of this route is flexibility: you can generally see any provider in the country that accepts Medicare, without a plan network or referrals.

The tradeoff is that you need to manage the distinct coverage pieces and understand how each premium fits together.

Route two: Medicare Advantage, all in one

You cannot use Medicare Supplement Insurance with Medicare Advantage.

Medicare Supplement Insurance supplements Original Medicare. Medicare Advantage is a private-plan alternative way to receive your Part A and Part B benefits. A benefitbay licensed Medicare Advisor will help you compare the complete route—not try to layer both together.

Timing makes a difference

Your Part B effective date starts important planning windows. In particular, many people receive a six-month Medicare Supplement Insurance Open Enrollment Period beginning when Part B becomes active. During that period, they have important purchase protections. If you wait, health questions, availability, and pricing may be different, depending on your state.

This is why benefitbay begins the Medicare conversation before the old group or individual plan ends. Getting Parts A and B active on time protects both your coverage start and your ability to use the ICHRA (CHOICE) benefit as intended.

Make the comparison about your reality

Bring your provider list, medications, preferred pharmacy, travel plans, household budget, and desired level of flexibility. The benefitbay Medicare Team will use those inputs to focus the comparison on what you will actually use.