I'm looking for an outfit to handle the billing of some
spiritual/chiropractic care. I started this once before, and then
found out that the forms would have to be sent to an agency that would
reject them and then I'd have to apply again using that form, and I'm
not interested in that headache, I'm interested in paying someone else
who's used to it.

I know there are billing experts out there. I'm looking for one in
southern California who's accustomed to stuff like Christian Science
practitioners. Extra tip for a directory of many and a page on how to
best work with third party consumer billing people.