Brian P. O'Connor, M.D., MPH
Internal Medicine Physician · Walnut Creek, CA
Brian P. O'Connor, M.D., MPH is an internal medicine physician with a practice address in Walnut Creek, California, and NPI 1487087615, issued on Aug 12, 2013. Check the license (California A131848, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian P. O'Connor
- Credential
- M.D., MPH
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A131848 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1220 Rossmoor Parkway, Walnut Creek, CA 94595
- Phone
- (925) 947-3312
- Enumerated
- Aug 12, 2013
- Record last updated
- Sep 7, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (925) 947-3396
- Medicaid ID
- 390200000X CA
- Medicare enrollment
- Enrolled (PECOS I20151008000532); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 1220 Rossmoor Parkway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Brian P. O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A131848Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
225 Medicare Part D claims for 102 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 23 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen14 claims
- Cefpodoxime Proxetil12 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 practice group's MIPS final score for 2023 (Medicare payment program): 85.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $167.42
1 payment: food and beverage; the largest payer was Grifols USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- John Muir Physician NetworkBrentwood, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
183 internal medicine physician records list a practice address in Walnut Creek
They are 183 of the 6,170 NPPES records with a practice address in Walnut Creek, and 17,696 internal medicine physician records in California.
All 183 in Walnut Creek → All 17,696 in California → Every provider in Walnut Creek →
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- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Brian P. O'Connor, M.D., MPH's NPI number?
Brian P. O'Connor, M.D., MPH's National Provider Identifier (NPI) is 1487087615, issued on Aug 12, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Brian P. O'Connor, M.D., MPH located?
The NPPES record lists a practice address at 1220 Rossmoor Parkway, Walnut Creek, CA, 94595. Phone: (925) 947-3312. Providers update this record themselves, so call before visiting.
How can I verify Brian P. O'Connor, M.D., MPH's license?
NPPES lists California license number A131848, 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 P. O'Connor, M.D., MPH prescribe under Medicare Part D?
In 2024, Brian P. O'Connor, M.D., MPH had 225 Medicare Part D claims for 102 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Brian P. O'Connor, M.D., MPH's MIPS final score?
The 2023 MIPS final score is 85.7 of 100, reported for the practice group. 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.