Dr. William Hamstra, DO

Dr. William Hamstra, DO

General Surgery  ·  
Male  ·  
Age 64
Dr. William Hamstra, DO is a general surgery specialist in San Ramon, CA and has been practicing for 27 years. He graduated from Oklahoma State Univ Center For Health Sciences College Of Osteopathic Medicine in 1986 and specializes in general surgery and surgery.

2305 Camino Ramon Ste 217

San Ramon, CA 94583

Contact Information

(925) 447-0660

Insurance Accepted

  • Aetna
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of California
  • Cigna
  • First Health (Coventry Health Care)
  • Health Net of California
  • Hill Physicians Medical Group
  • Humana
  • MultiPlan
  • 2 More

*Please verify this information when scheduling an appointment.

Learn about Dr. Hamstra

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you.

Top Care Areas

See how frequently Dr. Hamstra performs your care needs compared to other doctors.

more than 5% of peers
Paraesophageal Hernia Repair, Laparoscopic
more than 5% of peers
Anal Disorders
more than 5% of peers

Dr. Hamstra's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

Care Philosophy

This content was provided by Dr. Hamstra "Our care philosophy as an Osteopathic practice is to provide comprehensive care, integrating the mind and body, in order to alleviate pain, increase wellness, and improve health. Rather than focusing exclusively on the disease and its symptoms, we believe in treating the whole person to ensure high quality, total care of the patient. "

2  Specialties

  • General Surgery
  • Surgery

1  Board Certifications

  • General Surgery
    Accredited by: American Osteopathic Board of Surgery*

50  Conditions Treated


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65  Procedures

  • Abscess Incision and Drainage
  • Abscess or Fluid Incision and Drainage
  • Advanced Robotic Surgery
  • Appendectomy, Laparoscopic
  • Biopsy
  • Biopsy of Affected Tissue
  • Biopsy of Breast
  • Breast Surgical Procedure
  • Colectomy
  • Colectomy and Sigmoidectomy With Robotic Assistance
  • Colon and Rectal Surgery
  • Colorectal Surgery, Robotic-Assisted
  • Cyst Incision and Drainage
  • da Vinci® Gallbladder Removal
  • da Vinci® Robotic Surgery
  • Dressing and-or Debridement of Wound, Infection, or Burn (incl. Negative Pressure Wound Therapy)
  • Enterostomy (Laparoscopic or Open)
  • Esophageal Surgery
  • Excision of Benign Skin Lesion
  • Excision of Breast Tumor
  • Excision of Cyst
  • Excision of Neck Mass
  • Excision of Skin Cancer
  • Excision of Skin Lesion
  • Excision of Soft Tissue Lesion
  • Excision, Shaving, or Destruction of Skin and Subcutaneous Tissue (incl. Mohs Micrographic Surgery), Tissue Transfer
  • Excisional Biopsy
  • Gallbladder Removal
  • Gallbladder Removal (Cholecystectomy), Laparoscopic
  • Gastric Bypass Surgery, Laparoscopic
  • Gastroenterology Procedures
  • Head and Neck Surgery
  • Heart Surgery
  • Hemorrhoidectomy or Excision of Anal Tags
  • Hernia Repair
  • Incisional Hernia Repair, Laparoscopic
  • Inguinal Hernia Repair, Laparoscopic
  • Kidney Surgery
  • Laparoscopic Cholecystectomy With Robotic Assistance
  • Laparoscopic Diaphragmatic or Paraesophageal Hernia Repair With Robotic Assistance
  • Laparoscopic Splenectomy
  • Laparoscopic Surgical Procedure
  • Laparotomy
  • Lymph Node Biopsy or Excision
  • Mastectomy
  • Minimally Invasive Parathyrodectomy
  • Open Diaphragmatic and-or Paraesophageal Hiatal Hernia Repair
  • Open Incisional and-or Ventral Hernia Repair
  • Paraesophageal Hernia Repair, Laparoscopic
  • Parathyroidectomy
  • Peripheral Artery Catheterization
  • Port Placements or Replacements
  • Port Removal
  • Sentinel Node Biopsy
  • Single Incision Gallbladder Removal
  • Skin Biopsy
  • Sleeve Gastrectomy, Laparoscopic
  • Soft Tissue Mass Biopsy
  • Stomach Surgery
  • Thyroid Lobectomy
  • Thyroidectomy
  • Thyroidectomy or Thyroid Lobectomy
  • Total Splenectomy With Robotic Assistance
  • Umbilical or Ventral Hernia Repair, Laparoscopic
  • Wound Repair


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Background Check

0 Malpractice Claims

No malpractice history found for California.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Oklahoma State Univ Center For Health Sciences College Of Osteopathic Medicine
    Medical School | Graduated 1986
  • Normandy Osteo Hosps
    Internship Hospital | Completed 1987
  • Riverside Osteopathic Hospital
    Residency Hospital | Completed 1991
  • San Francisco Genl Hosp-Uc San Francisco
    Residency Hospital | Completed

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Hamstra has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

Dr. Hamstra does not have any memberships or affiliations listed. If you are Dr. Hamstra and would like to add memberships or affiliations, please update your profile.

Dr. Hamstra's Reviews

Likelihood of recommending Dr. Hamstra to family and friends
16 total reviews (3 have comments)

Likelihood to Recommend (16)

  • 5
  • 4
  • 3
  • 2
  • 1

Dr. Hamstra's Performance

  • Trustworthiness

  • Explains condition(s) well

  • Answers questions

  • Time well spent


Office & Staff Performance

  • Scheduling

  • Office environment

  • Staff friendliness

  • Average wait time

    Under 10 minutes
Dr. Hamstra Says:

Dr. Hamstra says, " Thank you so much for submitting a patient survey.  It is our goal to provide you with great service, in a welcoming environment.  If you received great service and attention, we invite you to tell a friend.  We are committed to providing you the best care.  Please let a member of my staff know if you have any suggestions to help us improve your care for future visits."


Patient Comments (3)

Doc Hamstra took my wife's case on from a late evening ER visit. Can't say enough positive things about him. Calm, confident, respectful and pure professional. 100% the person you want taking care of your loved ones in that OR. Not that we want to do it again, but if that was the case, Doc...more
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I have dealt with doctors and hospitals for 50 years. Two weeks ago I developed complications from a two week old abdominal emergency surgery that had been performed in Oregon. I was released, returned home, only to have the surgical site break open from an abscess. Dr Hamstra met me in the...more
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Dr Hamstra performed surgery on our son after his appendix ruptured. He took the time to walk is through the procedures, what could go wrong, and how they deal with it. He personally stayed engaged through the recovery and was always available to help us understand what was going on when we were...more
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