Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Ryan Thomas Ash, MD, PHD

Individual provider Psychiatry Physician · NPI 1023514411

Ryan Thomas Ash, MD, PHD practises 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.

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Practice location Address checks out

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

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients17
Services billed 90 a service is one billed item, such as a visit, a test or a procedure
Average patient age62

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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