https://data.cms.gov/Medicare-Enrollment/Opt-Out-Affidavits/7yuw-754z/data
Go to  Opt-Out website and search on provider's (applicant's) name.
Type in last name to upper right corner box = Search J8 MAC Part B.
Do a doctor's letter  
Login Info:
Email: mailbox@referencecompany.com
Password: mgPHO17=      (the O is the letter, not the number zero)