Nope. that is a ripoff, mate.
There are many prices for hospitals accomodations, and St.Louis overcharged (IMHO) 500% at least.
For next time I'll buy dripper and learn how to IV myself. it is no-brainer.
Or get some help from friends.
PS: 100K for 4 nights of staying in hospital with Dengue? Every hospital has some sort of luxury accomodation, suite, penthouse, whatever. So what?