According to the Summary Plan Descriptions, the FHA and HRA are treated differently in terms of continued access to the IBM plans.
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Prior to age 65, you should keep at ;least $1 in the FHA to be eligible to return to the IBM pre-Medicare insurance plans if you drop out of the IBM plans for a time.?
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Once you are 65 and become eligible for Medicare, the FHA converts to the HRA.? Under the current rules, as long as you were eligible to enroll at age 65, you will always be eligible to return to the IBM MA plans in the future if you drop out for a while, even if you have a $0 HRA balance.?
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I used all of my HRA funds and have a $0 balance. I have not been enrolled in the IBM MA plans for the last 2 years, but have been eligible to enroll during open enrollment each year, so I know this really works.
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IBM could choose to change the rules in the future, so if you are really worried, leave $1 in the HRA.??