NPPES file of Aug 9, 2026

Michael O'Connor, MD

Emergency Medicine Physician · San Francisco, CA

Michael O'Connor, MD is an emergency medicine physician with a practice address in San Francisco, California, and NPI 1326188228, issued on Feb 8, 2007. Check the license (California A40941, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1326188228
Name
Michael O'Connor
Credential
MD
Primary taxonomy
Emergency Medicine Physician 207P00000X
License number
A40941 CA
Self-reported in NPPES; status is on the state search
Practice location
845 Jackson St, San Francisco, CA 94133
Phone
(330) 493-4443
Enumerated
Feb 8, 2007
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →

Also registered at 845 Jackson St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Jack Bertman, M.D.Emergency Medicine Physician1891777967
  2. Michael Bogner, MDEmergency Medicine Physician1235279134
  3. Jingyan Chen, PHARMDPharmacist1255154472
  4. Irwin Chow, MDAnesthesiology Physician1184637530
  5. Ivan Cometa, M.D.Emergency Medicine Physician1437530706
  6. Roger Eng, MDDiagnostic Radiology Physician1871607291

Verify Michael O'Connor in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A40941    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Michael O'Connor among 7,751 emergency medicine physician records in California

Michael O'Connor, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 40% of them.

  • NPI issued2007 · 40% of these records are older, 50% newer
  • In a Medicare fileNo · 81% of these records are
  • In the CMS Doctors and Clinicians fileNo · 59% of these records are
  • Record last updated2007 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Emergency Medicine Physician providers in California

There are 7,751 emergency medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 7,751 in California → Every provider in San Francisco → Emergency Medicine Physician nationwide →

The 8 emergency medicine physician records with the nearest ZIP codes

  1. Jack Bertman, M.D.San Francisco, CA 941331891777967
  2. Michael Bogner, MDSan Francisco, CA 941331235279134
  3. Ivan Cometa, M.D.San Francisco, CA 941331437530706
  4. David Rossi, M.D.San Francisco, CA 941331588614077
  5. Becky SchmitzSan Francisco, CA 941331699817973
  6. Michael Shafer, MDSan Francisco, CA 941331417097312
  7. Mai Shimada, M.D.San Francisco, CA 941331316289523
  8. Joseph Woo, MDSan Francisco, CA 941331366584658

Common questions

What is Michael O'Connor, MD's NPI number?

Michael O'Connor, MD's National Provider Identifier (NPI) is 1326188228, issued on Feb 8, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Michael O'Connor, MD located?

The NPPES record lists a practice address at 845 Jackson St, San Francisco, CA, 94133. Phone: (330) 493-4443. Providers update this record themselves, so call before visiting.

How can I verify Michael O'Connor, MD's license?

NPPES lists California license number A40941, 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.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.