William N. Gonser, M.D.
Diagnostic Radiology Physician · Fairfield, CA
William N. Gonser, M.D. is a diagnostic radiology physician with a practice address in Fairfield, California, and NPI 1952348617, issued on Jun 1, 2006. Check the license (California G73301, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William N. Gonser
- Credential
- M.D.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- G73301 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 B Gale Wilson Blvd, Fairfield, CA 94533
- Phone
- (707) 464-6510
- Enumerated
- Jun 1, 2006
- Record last updated
- Apr 16, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (707) 256-3508
- Medicaid ID
- 00G733010 CA
- Medicare enrollment
- Enrolled (PECOS I20040408001602); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 1988
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Also registered at 1200 B Gale Wilson Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Yusuf Ahmad, MDAnesthesiology Physician1104020262
- Tashira AlexanderRegistered Dietitian1902732480
- Nail Amro, M.D.Internal Medicine Physician1861413551
- Allan Au, M.D.Hospitalist Physician1427495563
- Erin Berntsen, ACNPAcute Care Nurse Practitioner1205640489
- Neeta BhasinCritical Care Pharmacist1457984882
Verify William N. Gonser in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G73301Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 3 group practices
- Adventist Health Physicians NetworkChico, CA
- Ukiah Adventist HospitalUkiah, CA
- Willits Hospital IncWillits, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William N. Gonser among 4,500 diagnostic radiology physician records in California
William N. Gonser, M.D. is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1988 · median 2004 among the 3,130 with a school on file
- Record last updated2012 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in California
There are 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in Fairfield → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Bryson Borg, MDFairfield, CA 945331255394227
- James Bronk, M.D.Fairfield, CA 945331609824556
- Stephen Farrell, MDFairfield, CA 945331376621276
- James McMahon, M.D.Fairfield, CA 945331770539413
- Robert Bloom, M.D.Fairfield, CA 945341396786935
- Stephen Bepko, M.D.Travis Afb, CA 945351528110095
- Theodore Jerdee, M.D.Travis Afb, CA 945351104806397
- Robert Jesinger, M.D.Travis Afb, CA 945351427042100
Common questions
What is William N. Gonser, M.D.'s NPI number?
William N. Gonser, M.D.'s National Provider Identifier (NPI) is 1952348617, issued on Jun 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William N. Gonser, M.D. located?
The NPPES record lists a practice address at 1200 B Gale Wilson Blvd, Fairfield, CA, 94533. Phone: (707) 464-6510. Providers update this record themselves, so call before visiting.
How can I verify William N. Gonser, M.D.'s license?
NPPES lists California license number G73301, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is William N. Gonser, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.