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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (12)

The overall average patient rating of Dr. William Loudon is Excellent. Dr. Loudon has been reviewed by 40 patients who have provided 12 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.6
Promptness 4.4
Courteous Staff 4.8
Accurate Diagnosis 4.4
Bedside Manner 4.4
Spends Time with Me 4.3
Follows Up After Visit 4.5

Specialties & Research

Dr. William Loudon, MD, PHD is board certified in Neurological Surgery.

  • He has special expertise in 2 areas:
  • Brain Cancer
  • Neurosurgery

Education & Awards

Dr. Loudon graduated from The University of Texas at Houston. He has 5 awards.

Orange County Medical Association’s Physicians of Excellence 2010-2012
Patients' Choice 5th Anniversary Award (2012 - 2013)
Patients' Choice Award (2008 - 2013, 2015)
Compassionate Doctor Award - 5 Year Honoree (2014 - 2015)
Compassionate Doctor Recognition (2010 - 2015)


Dr. Loudon has 12 hospital affiliations:

  • Hoag Memorial Hospital Presbyterian 
  • St. Joseph Hospital - Orange 


  • German
  • Spanish

> > > > Dr. William Loudon, MD, PHD

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Additional Information
Dr. William Gunter Loudon MD and PHD is a male Neurosurgeon, has 21 years of experience and practices in Neurological Surgery.
Where does Dr. William G. Loudon practice?
Dr. William Loudon has 1 office location.
Dr. William Loudon practices Neurological Surgery near Orange, CA.
See Orange Surgeons.