How do I get a copy of my acceptance letter for Medicaid?

You call your Medicaid caseworker and ask for a copy. They can send it snailmail, email or text. You should have got one in the mail.

If this is all new to you, I suggest you have a folder for all info they send you. Yearly you will have to renew. I keep copies of the forms I have sent them and any paperwork I had to include which is usually an updated bank statement.