(tangentially related idea above)
An interesting idea and all, but I don't see what it has to do with Bitcoin.
Because what I just described would break a whole bunch of laws and threaten bloated insurance companies. Without the option of anonymity and really low transaction costs it probably wouldn't even work at all.
Possible liabilities:
1. Security risk - someone gains access to hospital account or patient's bitcoin wallet
2. How much will bitcoin transaction fees rise and will this make smaller transactions more expensive?
3. Adoption - Will consumers adopt this system and can we make it easier for average users rather quickly if a large healthcare system wanted to use bitcoin?
4. Currency conversion - Hospitals will want to convert to local currency and I believe there are systems already which can calculate bitcoin value at the time of payment and convert instantly.
2. Transaction fees probably won't rise significantly for a long time, as there isn't much deterring miners from including every transaction that has any fee at all. And even if the average transaction fee does become significant, you'll be able to pay a smaller fee and just get it confirmed more slowly. For smaller transactions the hospital can just accept them unconfirmed.
3. If this large healthcare system is the first big business to adopt Bitcoin, most consumers would probably just interpret it as more trouble than it's worth and just use Bit-Pay or something.
4. That is correct, Bit-Pay does this. You don't need to expose yourself to "Bitcoin the store of value" if you just want to use "Bitcoin the payment mechanism".
Now what about consumers? Can they get the same service and simply have an exchange/payment system linked to their fiat currency account and make instant conversion based payments at current market value? Will bitcoin pricing stabilize enough that consumers would feel comfortable holding bitcoins? Will these instant conversion services raise the whole transaction cost past credit card fees?
Bit-Pay with instant USD payout is 2.69%, versus at least 3.5% for VISA. Unless consumers are willing to hold Bitcoins (and it does seem to be gradually stabilizing IMHO) they very well could end up paying more. But depending on how many times the money changes hands using VISA, those 3.5% fees could really add up. With Bitcoin you only face significant fees while entering and exiting the system.