In every case of Orthognathic surgery, 2 types of dentists are concerned. One is Orthodontist and other is a Maxillofacial surgeon. Taking your X-rays and impressions of both jaws, Orthodontist will decide upon the treatment ( along with surgery) to be performed and Maxillofacial surgeon will do the surgery. So, it is basically a team work.
Next Steps
Visit a Multi speciality dental hospital to get proper diagnosis and treatment planning. As per prices are concerned, they will vary from case to case and can be decided only once proper treatment planning has been done.