If you're talking about whether or not LTAC counts for CRNA school, it doesn't. CRNA school requires ICU experience, but I guess it depends on your LTAC's ICU whether or not that would count or not. You could just ask the CRNA schools that you're interested in, and they will tell you how to proceed.
Personally, if I were going to attend a CRNA program, I would want the highest quality ICU experience wherever that may be (as far as acuity of patients, etc). Don't know how acute your LTAC's ICU is.
If this is not what you were asking, then it's not a helpful reply lol. But, most people wanting to know if their ICU experience "counts," want to know if it will work for CRNA school. I work in an ICU, and I wish that I were remotely interested in being a CRNA since the extra money would be nice to put away for retirement, vacations, helping out the parents when they age, etc. For whatever reason, I have always been attracted to things that don't pay well. In college: wanted to be a social worker or school counselor. And, let's face it: many things pay better than nursing, but that's not why we became nurses.
As far as graduate degrees, I probably will end up going for nursing education (pending how much I enjoy precepting in the future, have only precepted once as a fill in back in the day lol, but enjoyed it), which is probably the lowest paying graduate nursing degree you can obtain since it doesn't pay any better than bedside nursing for the most part lol (if you have your masters only), but I make my career choice based on where my passion is (and there's nothing wrong with making career choice based on money, and I'm not even implying that's why you want to be a CRNA, but let's face it: if it didn't pay well, most people wouldn't bother with the intense training).