Dr. William Norman Hamstra , DO
Surgery • San Ramon, CA
This profile is compiled from official public domain records provided by CMS and the NPPES registry. TRUE-MEDINFO is an independent reference directory and does not provide medical advice, diagnosis, or treatment recommendations. Always consult a licensed medical professional for personal health decisions.
Professional Overview & Biography Verified Profile Summary
Dr. William Hamstra, DO is a registered Surgery practitioner in San Ramon, CA. With approximately 40 years of clinical practice since graduating from Oklahoma State University College Of Osteopathic Medicine in 1986, Dr. Hamstra provides healthcare services at the registered practice location at 2305 CAMINO RAMON.
Dr. Hamstra is affiliated with Permanente Medical Group Inc and accepts Medicare assignment.
Frequently performed procedures and clinical services include established patient outpatient office visit, new patient outpatient office visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.
Practice Location & Contact Primary Location
2305 Camino Ramon
Suite 217
San Ramon, CA 945831396
Medicare Profile & Education
Oklahoma State University College Of Osteopathic Medicine
1986
✓ Accepts Assignment
In-Person Only
Specialty Benchmarks & Practice Insights
Comparative analytics for Surgery in San Ramon, CA
Practicing in San Ramon, CA (3346 Statewide)
In-Person Office Visits Only
Under CMS Medicare Fee Schedule vs Standard Submitted Charges
Clinical Seniority & Experience Comparison
Performed Procedures & Service Volume
Top Medicare Part B procedures performed by this practitioner
| HCPCS Code & Description | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
|
99213
Established patient office or other outpatient visit, typically 15 minutes
|
27 | 20 | $160.25 | $81.24 |
|
99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
|
18 | 18 | $237.80 | $119.06 |
|
99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
|
11 | 11 | $358.95 | $179.39 |
Medical Specialties & State Licenses
NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Additional State Medicaid & Healthcare Payer Identifiers
Hospital & Practice Group Affiliations
Permanente Medical Group Inc
7373 W Lane, Stockton, CA 952103377
Phone: 2094762000
Practice Associates & Co-Workers
Healthcare professionals and specialists practicing at this location or sharing practice phone/fax
Internal Medicine - Endocrinology, Diabetes & Metabolism
Doctor of Medicine (M.D.)
Pediatrics
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Medicine (M.D.)
Ophthalmology
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Osteopathic Medicine (D.O.)
Pediatrics
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Chronological log of verified NPI updates, location relocations, credentials, and registry changes
NPI status registered as active in NPPES database
Registered at 2305 CAMINO RAMON, SUITE 217, SAN RAMON, CA 945831396 (Tel: 9254470660)
Registered at 2305 CAMINO RAMON, SUITE 217, SAN RAMON, CA 945831396 (Tel: 9254470660)
Recorded as WILLIAM HAMSTRA, D.O.
Surgery (License #20A5413 in CA)
First registered as active Individual Practitioner in NPPES Database.
Patient & Community Reviews
Verified patient ratings, medical care experiences, and facility photos
Sign in to leave a review for Dr. William Hamstra
Only verified registered users can submit ratings, post feedback, and upload facility photos.
NPI Administrative Meta
Mailing Address
2305 Camino Ramon, Suite 217
San Ramon, CA 945831396
Phone: 9254470660
This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.