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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (9)

The overall average patient rating of Dr. William Hamstra, Surgeon is Excellent. Dr. Hamstra has been reviewed by 20 patients who have provided 9 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 5.0
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 4.9
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

  • He has special expertise in 13 areas:
  • Appendectomy
  • Cancer
  • Colon Cancer
  • Diverticulitis
  • Gallbladder Surgery
  • Heartburn
  • Hemorrhoids
  • Hernia
  • Inflammatory Bowel Diseases (IBD)
  • Laproscopic Surgery (Laparoscopy)
  • Mastectomy
  • Skin Cancer
  • Weight Loss Surgery (Bariatric Surgery)

Education & Awards

Dr. Hamstra graduated from Oklahoma State University , Tulsa. He has 3 awards.

Patients' Choice 5th Anniversary Award (2012)
Patients' Choice Award (2008 - 2012)
Compassionate Doctor Recognition (2010 - 2012)


Dr. Hamstra has 4 hospital affiliations:

  • Valley Memorial Hospital 
  • Doctors Hospital of Manteca 

> > > > Dr. William Hamstra, DO

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Additional Information
Dr. William N. Hamstra DO is a male Surgeon and practices in Surgery.
Where does Dr. William N. Hamstra practice?
Dr. William Hamstra has 2 office locations.
Dr. William Hamstra practices Surgery near San Ramon, CA.
Additional practice locations include: Livermore, CA.
See San Ramon Surgeons.