Because a friend has included "PC" after her name, I've been doing a lot of digging to find the very answer you're seeking. I have consistently been finding that the letters "PC" in this case have nothing to do with medicine, but rather mean "Professional Corporation." In other words, the doctor has incorporated his services into a larger company.
Medical Specialist
Naturopathic Medical Doctor
No, anyone who has completed a doctoral program in any field can place the designation Dr before their name. This includes doctors of philosophy (PhD), doctors of medicine (MD), doctors of chiropractic (DC), doctors of dentistry (DDS), doctors of veterinary medicine (DVM), doctors of optometry (OD), etc.
Medical Doctor, A Professional Corporation
MMM most commonly stands for moist mucous membranes.
LA Doctors
It has nothing to do with medical qualifications, it merely shows the doctor is also a Justice of The Peace (Magistrate)
In medical circles ARNP is Advanced Registered Nurse Practitioner
Naturopathic Medical Doctor
I think it means certified independent medical examiner. Insurance companies pay doctors to examine injured people and prepare reports to determine if the insurance company will pay for medical bills or for the injury and the pain, suffering and limitations the injury caused.
it is "M.D." and means medical DOCTOR
M.D. is the degree (Doctor of Medicine) awarded to graduates of allopathic medical schools. Physicians or "Medical Doctors" can have either the M.D. or D.O. degree in the United States.