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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 (2)

The overall average patient rating of Dr. William Prey is Good. Dr. Prey has been reviewed by 5 patients who have provided 2 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 4.6
Promptness 4.3
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 4.6

Specialties & Research

Dr. William Prey, MD is board certified in Psychiatry.

  • He has special expertise in 9 areas:
  • Attention Deficit Disorder (ADD) / Attention Deficit Hyperactivity Disorder (ADHD)
  • Bipolar Disorder / Manic Depressive Disorder
  • Depression
  • Depressive Disorder
  • Eating Disorders
  • Insomnia
  • Mood Disorders
  • Schizophrenia
  • Sleep Disorders

Education & Awards

Dr. Prey graduated from Pennsylvania State University, Hershey.


Dr. Prey has 4 hospital affiliations:

  • California Pacific Medical Center - Davies Campus 
  • St. Luke's Hospital 


  • English

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Additional Information
Dr. William Taylor Prey MD is a male Psychiatrist, has 31 years of experience and practices in Psychiatry.
Where does Dr. William T. Prey practice?
Dr. William Prey has 3 office locations.
Dr. William Prey practices Psychiatry near San Francisco, CA.
Additional practice locations include: Mill Valley, CA and Roseville, CA.
See San Francisco Psychiatrists.