Summary

Dr. William Hamstra treats cholelithiasis, acute cholecystitis, and obesity and overweight, and performs laparoscopy. He has practiced surgery and other specialties for 40 years and is affiliated with Stanford Health Care Tri Valley.

Dr. Hamstra completed his residency at Riverside Osteopathic Hospital and sees patients in San Ramon and Stockton, California. He speaks English and Spanish. Patients on Vitals rate Dr. Hamstra 5 out of 5.

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

Compare with Similar Doctors

Dr. William Norman Hamstra, DO
John Zopfi, DO
William Fulton, DO
Majid Kianmajd, DO
Dr. William Norman Hamstra, DOJohn Zopfi, DOWilliam Fulton, DOMajid Kianmajd, DO
SurgerySurgerySurgerySurgery
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
5 
2.8 
5 
0 
40 Years of Experience 40 Years of Experience 25 Years of Experience 14 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English, Russian, Spanish Speaks English, Spanish
San Ramon , CAFairfield , CAFairfield , 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: A T Still University Kirksville College Of Osteopathic Medicine 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

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.

Similar doctors

Frequently Asked Questions

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.
Which hospitals is Dr. William Hamstra affiliated with?
Dr. William Hamstra is affiliated with Stanford Health Care Tri Valley.
What languages does Dr. William Hamstra speak?
Dr. William Hamstra speaks English and Spanish.
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.
Does Dr. William Hamstra accept my insurance?
You can see the insurance plans that Dr. William Hamstra accepts on their Vitals profile.

Data Sources

This provider profile is built using data from:

  • NPPES NPI Registry
  • State medical licensing boards
  • Healthcare system and provider network data

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.