Summary

Dr. William Hamstra is a surgeon with four decades of experience treating patients throughout California. He earned his medical degree from Oklahoma State University Center for Health Sciences College of Osteopathic Medicine and completed his residency at Riverside Osteopathic Hospital. Dr. Hamstra specializes in surgery with additional expertise in other medical areas. He is fluent in both Spanish and English, allowing him to serve a diverse patient population.

Dr. Hamstra practices at Stanford Health Care Tri Valley and maintains offices in San Ramon and Stockton, California. He focuses on treating gallstones, gallbladder inflammation, and abdominal wall hernias. His surgical expertise includes performing comprehensive health assessments and specialized tissue analysis procedures. Patients consistently rate him highly, giving him an average score of 5.0 out of 5 stars.

AI-generated from data on this provider profile.

Quick Facts

  • accepting new patients
  • 5
  • 40 years of experience
  • 16 insurance plans accepted
  • speaks Spanish, English
  • 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

Compare with Similar Doctors

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

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

MEDICAL LICENSE

Doctor Of Osteopathy, California, 2026, Active

EDUCATION & TRAINING

Residency

Riverside Osteopathic Hospital

Medical School

Oklahoma State Univ Center For Health Sciences College Of Osteopathic MedGraduated in 1986

Similar doctors

Frequently Asked Questions

Does Dr. William Hamstra accept my insurance?
You can see the insurance plans that Dr. William Hamstra accepts on their Vitals profile.
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 Spanish and English.
How can I make an appointment with Dr. William Hamstra?
You can find contact information for Dr. William Hamstra here on Vitals.
Does Dr. William Hamstra accept virtual/telehealth appointments?
Dr. William Hamstra has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.

Ensuring Data Transparency and Trust: A Guide to Vitals Doctor Listings and Reviews

Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.

Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.

Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.