Connor Galen O'Brien, M.D.
Critical Care Medicine (Internal Medicine) Physician · San Francisco, CA
Connor Galen O'Brien, M.D. is a critical care medicine (internal medicine) physician with a practice address in San Francisco, California, and NPI 1063788727, issued on Mar 27, 2012. Check the license (California A126717, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Connor Galen O'Brien
- Credential
- M.D.
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- A126717 CA
Self-reported in NPPES; status is on the state search - Practice location
- 535 Mission Bay Blvd S, San Francisco, CA 94143
- Phone
- (415) 353-2873
- Enumerated
- Mar 27, 2012
- Record last updated
- Sep 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (415) 353-2528
- Medicare enrollment
- Enrolled (PECOS I20200825001904); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 723 in California → Look up another NPI →
Also registered at 535 Mission Bay Blvd S
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Joseph Bayne, M.D.Adult Congenital Heart Disease Physician1316301179
- Alexis Beatty, MDCardiovascular Disease Physician1851427520
Verify Connor Galen O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A126717Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $336.35
5 payments; by number, the most common kind was food and beverage; the largest payer was Abiomed. The 2,708 providers of this specialty with any payment received $2,958.68 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 2 group practices
- Regents OF The University OF CaliforniaSan Francisco, CA
- University Anesthesia Medical GroupSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Connor Galen O'Brien among 723 critical care medicine (internal medicine) physician records in California
Connor Galen O'Brien, M.D. is one of 723 critical care medicine (internal medicine) physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 72% of them.
- NPI issued2012 · 72% of these records are older, 25% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2012 · median 2005 among the 559 with a school on file
- Record last updated2021 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in California
There are 723 critical care medicine (internal medicine) physician records in California.
All 723 in California → Every provider in San Francisco → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Christopher Barnett, MD, MPHSan Francisco, CA 941431538127717
- Sudhamayi Bhadriraju, M.D.San Francisco, CA 941431104116243
- Mallar Bhattacharya, MDSan Francisco, CA 941431063558757
- Samuel Brusca, M.D.San Francisco, CA 941431174942148
- Jonathan BudzikSan Francisco, CA 941431356632632
- Harold Collard, MDSan Francisco, CA 941431740245380
- Kenneth Fang, M.D.San Francisco, CA 941431760566020
- Yaron Gesthalter, MDSan Francisco, CA 941431013183599
Common questions
What is Connor Galen O'Brien, M.D.'s NPI number?
Connor Galen O'Brien, M.D.'s National Provider Identifier (NPI) is 1063788727, issued on Mar 27, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Connor Galen O'Brien, M.D. located?
The NPPES record lists a practice address at 535 Mission Bay Blvd S, San Francisco, CA, 94143. Phone: (415) 353-2873. Providers update this record themselves, so call before visiting.
How can I verify Connor Galen O'Brien, M.D.'s license?
NPPES lists California license number A126717, 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. 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.