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

Ryan Thomas Ash, MD, PHD

Individual provider Psychiatry Physician · NPI 1023514411

Ryan Thomas Ash, MD, PHD is a Psychiatry in Palo Alto, California. Graduated from Baylor College of Medicine in 2016, 10 years ago. Works from 3 locations. Licensed in California.

Years since qualifying
10
Trained at
Baylor College of Medicine
Licensed in
CA
In the registry since
2018
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

300 Pasteur Dr
Palo Alto, CA 94304-2203
Phone: (650) 723-4000
Show map & directions

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

Additional practice locations (2)

  • 675 18th St, San Francisco, CA 94143-4200 — (415) 476-7000
  • 37332 Diamond Oaks Dr, Magnolia, TX 77355-7526 — (281) 794-0316

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence A165366 (CA)

Record details

NPI number1023514411
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedApril 4, 2018
Last updated in NPPESOctober 18, 2025
Certification dateOctober 18, 2025

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolBAYLOR COLLEGE OF MEDICINE
Graduated 2016 (10 years in practice)
Accepts Medicare assignment Not indicated

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