What would be the purpose of disciplining someone over this, besides not providing information in adequate time?
Repeatedly showing that you are unable to handle your personal finances may have an impact on your job depending on what it is. Driver's for instance are entrusted with sometimes large amounts of money through COD checks and other means and are also often given high value packages, or packages that clearly are high value, but not identified as such.
If they can not be entrusted with their own personal finances because of repeated, note that the contract states three separate requests, than there is some question as to their ability to handle those items.
Unfortunately life happens and sometimes this type of thing comes up, it's not meant to punish those people. It's meant ensure that those that repeatedly have problems are not in positions where they could have access to merchandise or money. I personally would question whether or not that somebody that has had this happen to that many times has their act together.
The OP's situation is unfortunately common in today's world with our medical system the way that it is. We are lucky that we work for a company that takes care of our insurance and also provides reasonable disability coverage when something does go wrong.
As for the 72 hours, your best bet is to talk with your HR department, your BA would be helpful as well, but in the end it needs to go through HR anyway. Letting them know to expect the request and the circumstances would make sure that everything goes smoothly.
Good Luck!
~On another note ~ Welcome back BBAG, I guess you are living the dream when benefits are great.