COBRA and Medicare: which is primary?
Medicare pays first once you are 65 or older. Which one came first decides the rest, and in the commoner order Medicare says your COBRA will probably end rather than move into second place.
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Transitions
Medicare at life's turning points: retiring, moving, losing coverage, and changing plans.
Medicare when retiring
Four dates attach to retiring, not all counted from the same day, and the best known one is last. The first falls six months before you stop working, and it is a tax rule rather than a Medicare rule.