Summary

Dr. William Hamstra is a surgeon with four decades of experience in osteopathic medicine. He earned his medical degree from Oklahoma State University Center for Health Sciences College of Osteopathic Medicine and completed his residency training at Riverside Osteopathic Hospital. Dr. Hamstra specializes in surgery with additional focus areas, bringing extensive knowledge to his practice. He is fluent in both English and Spanish, allowing him to serve diverse patient populations.

Dr. Hamstra practices at multiple locations including Stanford Health Care Tri Valley and maintains affiliations with Kaiser Permanente Medical Group Surgery, Saint Joseph's Medical Center, and Dameron Hospital in San Ramon, California and Stockton, California. His surgical expertise includes treating gallbladder stones and gallbladder inflammation. He also addresses weight management concerns for patients dealing with obesity. Dr. Hamstra performs minimally invasive laparoscopic procedures along with comprehensive laboratory assessments to monitor patient health. Patients consistently rate him highly, giving him an average score of 5.0 out of 5 stars.
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Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 5
  • 40 years of experience
  • 16 insurance plans accepted
  • speaks English, Spanish
  • Riverside Osteopathic Hospital
  • 9 written reviews
  • 2 specialties
  • 12 areas of expertise
  • 1 hospital affiliation
  • 4 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. William Norman Hamstra has 4 locations

Hamstra William N Office

2821 Crow Canyon Rd Ste 201San Ramon, CA 94583
Mon9:00 am - 5:00 pm
Tue9:00 am - 5:00 pm
Wed9:00 am - 5:00 pm
Thu9:00 am - 5:00 pm
Fri9:00 am - 5:00 pm
SatClosed
SunClosed

Kaiser Permanente Medical Group Surgery

7373 West LnStockton, CA 95210
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed

Saint Josephs Medical Center

1800 N California StStockton, CA 95204

Dameron Hospital

525 W Acacia StStockton, CA 95203

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Dr. William Norman Hamstra, DO
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Dr. William Norman Hamstra, DODr. Mary HawnMajid Kianmajd, DOJohn Zopfi III, DO
SurgerySurgerySurgerySurgery
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
4.5 
2.8 
40 Years of Experience 35 Years of Experience 14 Years of Experience 40 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English, Spanish Speaks English, Spanish Speaks English, Russian, Spanish
San Ramon , CARedwood City , CAFairfield , CAFairfield , CA
Med School: Oklahoma State Univ Center For Health Sciences College Of Osteopathic Med Med School: UNIVERSITY OF MICHIGAN MEDICAL SCHOOL Med School: Touro University Nevada College Of Osteopathic Medicine Med School: Western Univ Health Sci College Of Osteopathic Medicine Of The Pacific
Current Profile
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Insurance Plans Accepted by Dr. William Norman Hamstra

  • Accepts Medicaid
  • Aetna
  • Blue Cross Blue Shield of Oklahoma
  • BLUE CROSS of CALIFORNIA
  • Blue Shield of California
  • Brand New Day
  • Cigna
  • Contra Costa Health Plan
  • Health Net
  • Health Net - HMO
  • Health Plan of San Joaquin
  • Health Plan of San Joaquin - Medicaid (Managed)
  • Kaiser Permanente
  • Kaiser Permanente - HMO
  • Medicare
  • Medicare - Medicare
  • UnitedHealthcare

Medical Specialties

Dr. William Norman Hamstra has the following 2 specialties

Specialty Expertise

Dr. William Norman Hamstra has the following 12 areas of expertise

  • Appendectomy
  • Cancer
  • Colon Cancer
  • Diverticulitis
  • Gallbladder Surgery
  • Heartburn
  • Hemorrhoids
  • Hernia
  • Inflammatory Bowel Diseases (IBD)
  • Laproscopic Surgery (Laparoscopy)
  • Other
  • Weight Loss Surgery (Bariatric Surgery)

Certifications, License, & Education

40 Years Experience

Dr. William Norman Hamstra holds an active medical license in the state of California.

Medical License

Doctor Of Osteopathy with an active medical license in the state of California that expires in 2026.

Education & Training

Residency

Completed their residency at Riverside Osteopathic Hospital.

Medical School

Graduated from Oklahoma State Univ Center For Health Sciences College Of Osteopathic Med in 1986.

NPI Number

Dr. Hamstra's NPI number is 1306835723.

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Frequently Asked Questions

Is Dr. William Hamstra accepting new patients?
Dr. William Hamstra is accepting new patients on Vitals. View Dr. William Hamstra's profile on Vitals to make an appointment.
What languages does Dr. William Hamstra speak?
Dr. William Hamstra speaks English and Spanish.
Does Dr. William Hamstra accept my insurance?
You can see the insurance plans that Dr. William Hamstra accepts on their Vitals profile.
Which hospitals is Dr. William Hamstra affiliated with?
Dr. William Hamstra is affiliated with Stanford Health Care Tri Valley.
Where is Dr. William Hamstra's office located?
Dr. William Hamstra's office is located at 2821 Crow Canyon Rd Ste 201, San Ramon, CA, 94583.

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