Under 3rd Class Medical Reform, When Do I Need To See My Doctor? Lets say I'm a 35 year old pilot who just had a medical renewed so that it doesn't expire until 2021. 3rd class medical reform (although not law yet) requires that I visit my regular physician once every 4 years. 

When do I need to see my doctor? 


Anytime prior to the expiration of my 3rd class medical? 
Do I surrender my 3rd class medical and go to the doctor immediately (after regulations pass of course)? 
Do I go to my doctor in 2020? 2019?
Do I wait until my 3rd class medical expires (or within a month or two)?
4 years after the expiration of my 3rd class medical?


And a bonus question:


Does the 4 year clock start ticking when my medical expires, when regulations are enacted, or some other time?


114th Congress Senate Bill 571 - Pilots Bill of Rights 2
The FAA hasn't written the regs yet so who knows. All that has happened is congress has told the FAA to write the refs

Personally I think it's foolish to use your personal doc. You're waving all your HIPPA rights and obligating your personal doc to report anything to the FAA without your consent. 

-Robert