When you find that hospital only plan, how will you pay the other half of your bills?
There are a few companies that offer hospital only plans, but no one I know would want them once they understand the way large claims (in particular) shake out.
If you look at any carriers books, you will see that about half their claims are due to inpatient procedures, the other half for outpatient.
Once you are discharged from the hospital, your care (and your claims) still continue to rack up. Meds, doc visits, therapy, etc can double the amount charged for the hospital stay.
You would be better off getting a HDHP with
HSA for about the same price, possibly less, than a hospital only plan.