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

William Norman Hamstra, DO

Individual provider Surgery Physician · NPI 1306835723

William Norman Hamstra, DO is a General Surgery in San Ramon, California. Graduated from Oklahoma State University College of Osteopathic Medicine in 1986, 40 years ago. Practices with Permanente Medical Group Inc, a 10,941-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
40
Trained at
Oklahoma State University College of Osteopathic Medicine
Licensed in
CA
In the registry since
2005
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.

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Practice location Address checks out

2305 Camino Ramon Ste 217
San Ramon, CA 94583-1396
Phone: (925) 447-0660
Fax: (925) 443-7506
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 20A5413 (CA)

Record details

NPI number1306835723
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedOctober 18, 2005
Last updated in NPPESFebruary 11, 2022
Mailing address2305 Camino Ramon, Suite 217, San Ramon, CA 94583-1396

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolOKLAHOMA STATE UNIVERSITY COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 1986 (40 years in practice)
Group practice Permanente Medical Group Inc — 10941 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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