No, this isn't a bad fungus spreading northwest towards Washington. This map from the Robert Wood Johnson Foundation (via MSNBC) shows health care costs across the country, and yes, you are included Hawaii and Alaska.
As you can see health care costs are from uniform country-wide.
However, the color scale is kind of funky. I'm guessing it was automatically chosen by the mapping software to even split the number of regions amongst the five color bins, which I think kind of throws off the color distribution. I don't know. I think as a whole, the map is missing some special sauce.