Basically, a Medigap policy covers some of the costs that original Medicare does not cover — such as copayments, coinsurance and deductibles — or uncovered services, such as medical care when you’re traveling abroad.
When you first qualify for Medicare, you get a six-month window to purchase a Medigap policy without undergoing medical underwriting. This means the insurer cannot deny coverage based on existing conditions or charge you a higher premium.
After that initial window, however, Medigap insurers typically will evaluate your medical history and can charge you more or decline coverage altogether.
Even if you know you’ll breeze through the evaluation, it still can take time for all your records to reach the insurer.
“Underwriting can take a couple months,” Gavino said. “The worst-case scenario is that you have Parts A and B until you get the supplemental policy.”