Dandy - my husband & I generally sign authorization forms with each Doctor's office as soon as we get established as new patients, allowing the other spouse to have access/permission to speak with them about each of our medical histories. That way I can call for refills on his Rx, get his test results, schedule appts & vice versa as needed, etc. Once it's on file it stays on file until it's revoked.
I'm guessing MCE has something similar on file or legal documents like a Medical POA.