Key to Medical Credentials and Degrees

Credentials for Doctors:
A.A.N.: American Academy of Neurology
A.H.S.: American Headache Society
A.Q.H.: Certificate of Added Qualification in Headache Medicine (formerly know as CAQ)
C.B.I.S.: Certified Brain Injury Specialist
D.O.: Doctor of osteopathic medicine; equivalent to an M.D.
F.A.A.N.: Fellow American Academy of Neurology
F.A.C.P.:  Fellow of the American College of Physicians
F.A.H.S.: Fellow of the American Headache Society
M.B.B.S.: Bachelor of medicine, bachelor of surgery; an international medical degree equivalent to an M.D. in the U.S. system (also abbreviated as M.B., Ch.B.; M.B., B.Ch.; M.B., B.Chir.)
M.D.: Doctor of medicine

Credentials for Nurses:
R.N.: Registered nurse
N.P.: Nurse practitioner
A.P.N.P.: Advanced practice nurse practitioner (also abbreviated as A.P.N.)
A.P.R.N.: Advanced practice registered nurse (also abbreviated as A.P.R.)
C.N.P.: Certified nurse practitioner (also abbreviated as N.P.-C. or N.P.B.C.)
C.R.N.A.: Certified registered nurse anesthetist
D.N.P.: Doctor of nursing practice
L.P.N.: Licensed practical nurse
A.Q.H.: Certificate of Added Qualification in Headache Medicine

Credentials for Physician Assistants:
P.A.: Physician assistant
P.A.-C.: Certified physician assistant
A.Q.H.: Certificate of Added Qualification in Headache Medicine

Credentials for Dentists:
D.D.S.: Doctor of  Dentistry
D.M.D.: Doctor of Medical Dentistry
A.Q.H.: Certificate of Added Qualification in Headache Medicine

Credentials for Psychologists:
L.P.: Licensed Psychologists
Ph.D/Psy.D: Psychologist
A.Q.H.: Certificate of Added Qualification in Headache Medicine