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

John O'Brien Clarke III, MD

Individual provider Internal Medicine Physician · NPI 1467539643

John O'Brien Clarke III, MD is a Gastroenterology in Palo Alto, California. Graduated from University of Missouri, Columbia School of Medicine in 1999, 27 years ago. Practices with Stanford Health Care, a 3,085-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in California and Maryland.

Years since qualifying
27
Trained at
University of Missouri, Columbia School of Medicine
Licensed in
CA, MD
In the registry since
2006
Specialties on file
5
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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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)

  • 600 N Wolfe St, Baltimore, MD 21287-0005 — (410) 955-9696
  • 600 N Wolfe St, Baltimore, MD 21287-0005 — (410) 955-9696

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence C143081 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence D58832 (MD)
Internal Medicine Physician Taxonomy 207R00000X · Licence C143081 (CA)
Gastroenterology Physician Taxonomy 207RG0100X · Licence D58832 (MD)
Hospitalist Physician Taxonomy 208M00000X · Licence D58832 (MD)

Record details

NPI number1467539643
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 1, 2006
Last updated in NPPESApril 28, 2024
Certification dateApril 28, 2024

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolUNIVERSITY OF MISSOURI, COLUMBIA SCHOOL OF MEDICINE
Graduated 1999 (27 years in practice)
Group practice Stanford Health Care — 3085 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

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