I went through a legal firm and it took eight months. I was denied on the initial filing but was awarded on appeal. I do understand that my case was pulled for an audit. Perhaps it helped with the approval.
One plus, is that I had medical records from the same Rheumy for seven years and I do go every three months. My Dr. also generated a very detailed report (hx, dx, meds, everything) to help with things.
I wish you the best, it is a very stressful thing to go through.
Mere