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The F Plan pays virtually 100% of all your healthcare expenses including foreign travel. Your deductibles are covered and you have the best coverage available. Any physician in the country would accept your coverage. Medicare Advantage is more restricted, and has Co-Pays that can accumulate to about 6750/calendar year. Medicare Advantage does generally cover medication where as the F Plan does not (nor do any medicare supplement policies).
If you can afford the F Plan, it is GOLD. Medicare Advantage works very well but is not as broad or complete in coverage (other than the obvious advantage of covered medicines).