If you are carrying concealed and the hospital is not posted then you should be just fine going right in without any fuss or extra bother.
I've not had any problems at all in the Pittsburgh, PA. hospitals.
I can't imagine why Erie would be any different.
If you feel like you're going to be totally uncomfortable entering a hospital/ICU with your firearm then just discreetly lock it in your vehicle trunk.
BTW: Violent crime stats (murder, rape, robbery, etc.) in Erie are extremely low.
Non violent property type crimes are higher. So it's a pretty safe place.