Medical - Informing USCG of Evasive Surgey?

When is the proper time to inform the USCG when having evasive surgery? example triple bypass?

If you’re [I]already carrying a waiver for a cardiac condition[/I], you have 30 days to update the USCG of any change in your condition. A triple by-pass (being about as invasive a procedure as you can get) would certainly qualify… Otherwise (Now mind, I’m guessing), your next 719k physical would have to declare the procedure and you’ll undoubtedly end up with said cardiac waiver letter if you pass the med review. The gauntlet for that will involve any number of reports, evals and fax machines. Only God knows how long it could take.