Christine S. O'Brien, MD
Emergency Medicine Physician · San Francisco, CA
Christine S. O'Brien, MD is an emergency medicine physician with a practice address in San Francisco, California, and NPI 1134207772, issued on Nov 1, 2006. Check the license (California A78053, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Christine S. O'Brien
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A78053 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2200 Ofarrell St, San Francisco, CA 94115
- Phone
- (415) 833-2000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 8, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A780530 CA
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 2200 Ofarrell St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Christine S. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A78053Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% fewer Medicare Part D claims than the average emergency medicine physician in 2024
175 Medicare Part D claims for 114 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Ondansetron Odt13 claims
- Albuterol Sulfate Hfa11 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.
Christine S. O'Brien among 7,751 emergency medicine physician records in California
Christine S. O'Brien, 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. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2021 · 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.
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
- Stephen Anderka, MDSan Francisco, CA 941151083605455
- Steven Ansley, MDSan Francisco, CA 941151851382378
- Robert Bowyer, DOSan Francisco, CA 941151144211517
- Jennifer Brokaw, MDSan Francisco, CA 941151104817626
- Robert Colvin, MDSan Francisco, CA 941151629069158
- Mary Jane Connell, MDSan Francisco, CA 941151881685311
- Timothy Duncan, MDSan Francisco, CA 941151013908227
- Leif Eriksen, MDSan Francisco, CA 941151235120767
Common questions
What is Christine S. O'Brien, MD's NPI number?
Christine S. O'Brien, MD's National Provider Identifier (NPI) is 1134207772, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christine S. O'Brien, MD located?
The NPPES record lists a practice address at 2200 Ofarrell St, San Francisco, CA, 94115. Phone: (415) 833-2000. Providers update this record themselves, so call before visiting.
How can I verify Christine S. O'Brien, MD's license?
NPPES lists California license number A78053, 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 Christine S. O'Brien, MD prescribe under Medicare Part D?
In 2024, Christine S. O'Brien, MD had 175 Medicare Part D claims for 114 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
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.