Brian James Vierra, MD
Obstetrics & Gynecology Physician · Merced, CA
Brian James Vierra, MD is an obstetrics & gynecology physician with a practice address in Merced, California, and NPI 1659483154, issued on Aug 31, 2006. Check the license (California G70901, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian James Vierra
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G70901 CA
Self-reported in NPPES; status is on the state search - Practice location
- 378 W Olive Ave, Merced, CA 95348
- Phone
- (209) 725-7560
- Enumerated
- Aug 31, 2006
- Record last updated
- Dec 11, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (209) 725-7561
- Medicaid ID
- 00G709010 CA
- Medicare enrollment
- Enrolled (PECOS I20040224001264); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 378 W Olive Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Peter Herr, DPMPodiatrist1801015250
- Michael Salih, DPMPodiatrist1164526356
- Nikelle Severe, RNWound Care Registered Nurse1285907014
- Maiya Thao, DPMPodiatrist1104920297
- Lamin Tunkara, RN, WCCWound Care Registered Nurse1780930669
Verify Brian James Vierra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G70901Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
118 Medicare Part D claims for 41 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Estradiol49 claims
- Betamethasone Diprop Augmented15 claims
- Medroxyprogesterone Acetate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 96.5 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Merced Faculty Associates Medical Group IncorporatedMerced, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian James Vierra among 5,088 obstetrics & gynecology physician records in California
Brian James Vierra, MD is one of 5,088 obstetrics & gynecology 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 5% of them.
- NPI issued2006 · 5% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1987 · median 2004 among the 2,700 with a school on file
- Record last updated2020 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Merced → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Samuel Loredo, MDMerced, CA 953481164532958
- Annapurna Reddy, M.D.Merced, CA 953481871512400
- Chieh Tsai, M.D.Merced, CA 953481497753024
- Rebecca Brock, M.D.Modesto, CA 953501740213875
- Christopher Grover, MDModesto, CA 953501033192232
- Sabrina Hussain, M.D.Modesto, CA 953501629083902
- Lloyd Lee, M.D.Modesto, CA 953501336134303
- Lisa Murphy, MDModesto, CA 953501174506315
Common questions
What is Brian James Vierra, MD's NPI number?
Brian James Vierra, MD's National Provider Identifier (NPI) is 1659483154, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brian James Vierra, MD located?
The NPPES record lists a practice address at 378 W Olive Ave, Merced, CA, 95348. Phone: (209) 725-7560. Providers update this record themselves, so call before visiting.
How can I verify Brian James Vierra, MD's license?
NPPES lists California license number G70901, 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.
How much does Brian James Vierra, MD prescribe under Medicare Part D?
In 2024, Brian James Vierra, MD had 118 Medicare Part D claims for 41 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
What is Brian James Vierra, MD's MIPS final score?
The 2023 MIPS final score is 96.5 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.