Ana Lopez-O'Sullivan, M.D.
Emergency Medicine Physician · Torrance, CA
Ana Lopez-O'Sullivan, M.D. is an emergency medicine physician with a practice address in Torrance, California, and NPI 1235363193, issued on May 7, 2009. Check the license (California A114378, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ana Lopez-O'Sullivan
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A114378 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3105 Lomita Blvd, Torrance, CA 90505
- Phone
- (310) 784-4997
- Enumerated
- May 7, 2009
- Record last updated
- Jun 16, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20251208000189); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify Ana Lopez-O'Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114378Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% more Medicare Part D claims than the average emergency medicine physician in 2024
327 Medicare Part D claims for 206 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 16 claims were for opioids.
Most prescribed
- Ondansetron Odt51 claims
- Cefdinir37 claims
- Naproxen21 claims
- Famotidine20 claims
- Prednisone18 claims
- Oxycodone Hcl14 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.
Bills Medicare through one group practice
- Raleigh Emergency Medicine Associates IncRaleigh, NC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ana Lopez-O'Sullivan among 7,751 emergency medicine physician records in California
Ana Lopez-O'Sullivan, M.D. 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 2009, is newer than 54% of them.
- NPI issued2009 · 54% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2009 · median 2011 among the 4,560 with a school on file
- Record last updated2014 · 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).
197 emergency medicine physician records list a practice address in Torrance
They are 197 of the 8,901 NPPES records with a practice address in Torrance, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Torrance → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Elisa Anhalt, MDTorrance, CA 905051194773424
- Ellen BakerTorrance, CA 905051588612477
- Michael Baker, MDTorrance, CA 905051922030238
- Darren Bedolla, MDTorrance, CA 905051114956299
- Mark Gellman, DOTorrance, CA 905051669493375
- Robert Gibbs, MDTorrance, CA 905051043326366
- Kane Kuo, M.D.Torrance, CA 905051588600993
- Brett Lorber, MDTorrance, CA 905051225148042
Common questions
What is Ana Lopez-O'Sullivan, M.D.'s NPI number?
Ana Lopez-O'Sullivan, M.D.'s National Provider Identifier (NPI) is 1235363193, issued on May 7, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Ana Lopez-O'Sullivan, M.D. located?
The NPPES record lists a practice address at 3105 Lomita Blvd, Torrance, CA, 90505. Phone: (310) 784-4997. Providers update this record themselves, so call before visiting.
How can I verify Ana Lopez-O'Sullivan, M.D.'s license?
NPPES lists California license number A114378, 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 Ana Lopez-O'Sullivan, M.D. prescribe under Medicare Part D?
In 2024, Ana Lopez-O'Sullivan, M.D. had 327 Medicare Part D claims for 206 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.