There are situations where Medicare is the designated secondary carrier. Most common is where you or your spouse is covered under an employer group health plan and the employer has 20+ full time employees.
The group plan is primary, Medicare is secondary.
That does not mean Medicare will pay anything towards the claim. The two plans coordinate.
The only time I am aware that Medicare is secondary is when you are covered under and employer group health plan if there are more than 20 full time employees. I always advise people in that situation to take out the Part A of Medicare and delay getting both Part B and Part D until you retire or come off your employer's group health plan. You do not need Part B or Part D as long as you are covered under an employer plan. The Part B premium this year for new people enrolling in Medicare is $121.80 and you don't need Part B if you are covered by your employer since the employer coverage is primary. You can go ahead and enroll in Part A of Medicare because it is free.
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The group plan is primary, Medicare is secondary.
That does not mean Medicare will pay anything towards the claim. The two plans coordinate.