You don't have to let that stop you getting a list from Medimaps. When there is information that I really need, I circumvent the fear of my email address being sold by using an anonymous one which helps me identify who has sold my information. In fact, I created my Mayo Clinic Connect account using one of these.
If I want to, I can turn that anonymous one off, and stop receiving all mail that is sent to it. The service I use to do this is SimpleLogin. They have both a free and a paid account option. With the free account you can have up to 10 anonymous email addresses at any given time. Each can be turned off and on at will.
It's is owned by a highly secure Swiss-based encrypted email provider called Protonmail, with whom I have my true email account. The two can be used independent of one another, so you don't have to have a Proton account to be able to use the anonymous email service.
Signing up does require that you supply your real email address, because they have to know where to forward the mail that is being sent to your anonymous addresses.
Ever since I started using the service, I haven't received any spam emails that I couldn't trace and turn off.
It's easy to sign-up, and easy to use. Just so you know, I don't work for them, and have nothing to gain by sharing this information with you. I myself, use only the free options for both services, SimpleLogin, and Protonmail.

About SimpleLogin and Proton: https://simplelogin.io/about/

PC magazine review of SimpleLogin: https://www.pcmag.com/reviews/simplelogin

SimpleLogin account registration: https://simplelogin.io/docs/getting-started/register-account/

Protonmail encrypted email service: https://proton.me/