Indeed, but the client has to initiate contact with you. There is no way that you can effectively sell C or D plans over the phone when cold calling. You would have to mail the cold call a Scope form, have them mail it back to you, and then you could sell them C or D over the phone. Prospects 90% of the time will never mail a signed Scope form back to you for you to call them back and be in compliance. This is why I said it's impossible to sell over the phone. I'm referring to cold calling since this is what the original poster was talking about.
I have a hard enough time mailing a Scope form to a cold call T65 and picking it up when I meet them at their home for an appointment. About 50% of the time they never signed it and I have to better explain why it is needed and that I must leave if they don't sign it. Remember that 65 year olds are a very paranoid age group due to all the scams they experienced in their life and all the 'good deals' that previous salesmen have told them that turned out to be a bad deal for them.
You cannot cold call for MA or PDP PERIOD! You don't need to mail a scope for a T65 cold call or telemarketing lead because you couldn't possibly sell it if they were interested. If they wanted a MA plan or PDP you'd have to refer it to another agent and tell the prospeect to call that agent first...