Do not tell them unless your ability to perform on the job comes into question by your boss, and you have no choice because you may get fired. So generally, I see it as a bad idea to tell your employer. At the very least, they will probably allow you to give your two week notice.

I told my employer when I ended up in a private psych hospital for a month. I was one of their star performers that can fix anything that came up on their computer systems. That month cost me $100,000, which my employer paid. They later invited me back to fix a big crisis they were having with their systems. I succeeded and was given one year severance pay.

But this was an outrageous exception. Please do not try what I got away with! I was just awfully lucky, and had very understanding management. They were going to find out anyways during my stay at the hospital.

tucson