I'm sorry you're having to deal with the frustrations of finding help. I have bulimia, not anorexia, so my weight isn't a determining factor. I know they admit people with EDNOS too, whose weight may or may not be <85% of IBW, so could it just be the place you called?
I've twice been to Renfrew's Philly ED inpatient (1989 and 2001). I researched it in 2011 and wouldn't have gone back. I would have gone to the Eating Disorder Center in Denver, however.
I've also been to the Meadows for their trauma program, which didn't really address ED, but tried to be supportive of me. In my experience, there are pros and cons to each way. At ED place, you can be medically stabilized, if that is a necessity. They are attuned to refeeding and are supportive of the anxiety that comes with weight gain. I found that the constant focus on food and how I felt about food was a bit unhelpful for me. I was trying NOT to obsess about food, and here they were talking about it 24/7. Moreover, I had my fair share of ptsd issues while at ED place and they had very little in place to help me. To be fair, that was 14 yrs ago though.
I had much better success going to the trauma place first, following it up with ED PHP and then IOP, but again, I didn't need weight restoration.
I know Butterfli was able to get a single use agreement with someplace in Iowa to accept her Missouri Medicare. Maybe she'll have some advice.
At any rate, please don't intentionally lose weight. Don't give the hospital your power.