Medigap Plan G from AARP/UnitedHealthcare gives you the best coverage for cancer treatment. If you can't get Medigap, choose an Aetna Medicare Advantage plan instead.

Cigna sells cheap Medicare Advantage plans with good coverage. But the company has below-average customer service.

The ruling comes just months after the city had attempted to switch retirees from their traditional Medicare to a privatized Medicare Advantage Plan from Aetna.

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