Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. William Roy Mains, MD

Individual provider Addiction Psychiatry Physician · NPI 1477751741

Dr. William Roy Mains, MD is a Psychiatry in Oakland, California. Graduated from University of California, San Diego School of Medicine in 1996, 30 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
30
Trained at
University of California, San Diego School of Medicine
Licensed in
CA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

7200 Bancroft Ave Ste 133
Oakland, CA 94605-2403
Phone: (510) 553-8500
Fax: (510) 553-8550
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction Psychiatry Physician (primary) Taxonomy 2084P0802X · Licence A65356 (CA)

Record details

NPI number1477751741
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 6, 2007
Last updated in NPPESJanuary 7, 2010

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolUNIVERSITY OF CALIFORNIA, SAN DIEGO SCHOOL OF MEDICINE
Graduated 1996 (30 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare