Unless of course you are considering one of the Advantage plans, Medicare is medicare, and you sign up though the government for it.
If you are talking about a policy to pay the co pay amounts of medicare again most are the very much the same, they are normally only a few choices in plans, each of the vendors will sell one of the 4 or 5 plan types available in your state.
Almost none of them cover all the different drugs well. So honestly don't expect to find one that pays well on all of the drugs used.
On this, go to the drug store and talk to the druggist there. Ask him to look at the drugs used and which drug plans would pay the best. ** some places will help you, others won't but it is a place to start.
Next ask the several companies that offer coverage for drugs ( normally drugs is a separate benefit) ask them for a list of their drug schedule and it will tell you what they will or won't pay for a long list of drugs.
On average, ** and I will give a disclaimer I am a licensed insurance agent*** but I do not current sell, I keep my license for other purposes. I have found that over all, for most people the AARP plan though United Healthcare is about the best plan around for cost and coverage, Does that mean it will pay for everything, no, does it always have the most coverage for some specific drugs no, but over all it is very good.