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

Dr. James Stephen Allen, DO

Individual provider Internal Medicine Physician · NPI 1902099518

Dr. James Stephen Allen, DO is an Internal Medicine in San Ramon, California. Qualified in 1983, 43 years ago. Practices with Sea Mar Community Health Centers, a 236-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in New York and Washington.

Years since qualifying
43
Licensed in
NY, WA
In the registry since
2007
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

6001 Bollinger Canyon Rd Chevron Singapore-Orchard
San Ramon, CA 94583-7170
Phone: (925) 842-3224
Fax: (925) 842-3242
Show map & directions

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

Additional practice locations (1)

  • 1813 Sumner Ave, Aberdeen, WA 98520-4600 — (360) 538-1293

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 159380-1 (NY)
Internal Medicine Physician Taxonomy 207R00000X · Licence OP61072641 (WA)

Record details

NPI number1902099518
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 27, 2007
Last updated in NPPESMarch 17, 2026
Certification dateMarch 17, 2026
Mailing address6001 Bollinger Canyon Rd, San Ramon, CA 94583-2324

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1983 (43 years in practice)
Group practice Sea Mar Community Health Centers — 236 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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