I copied this from the Medicare.Gov site for you:
Post# of 36537
There is no Donut Hole Insurance but there are ways to reduce your overall Part D spending. Insurance to cover the Donut Hole in Medicare Part D does not exist. There is no Donut Hole insurance policy that you can buy just to cover the higher expenses during the coverage gap
Enjoy your private health insurance because for meds, Medicare sucks. Trust me. This is my 3rd year on it and I have one of the best plans available.