Seamus David Lonergan, M.D.
Emergency Medicine Physician · San Francisco, CA
Seamus David Lonergan, M.D. is an emergency medicine physician with a practice address in San Francisco, California, and NPI 1407953391, issued on Sep 20, 2006. Check the license (California A90573, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Seamus David Lonergan
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A90573 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3360 Octavia St Apt 6, San Francisco, CA 94123
- Phone
- (415) 775-9619
- Enumerated
- Sep 20, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 775-9619
- Medicare enrollment
- Enrolled (PECOS I20260412000032); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify Seamus David Lonergan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A90573Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average emergency medicine physician in 2024
196 Medicare Part D claims for 147 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 24 claims were for opioids.
Most prescribed
- Acetaminophen-Codeine15 claims
- Cefdinir15 claims
- Ibuprofen15 claims
- Amoxicillin-Clavulanate Potass11 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.
Industry payments in 2024: $13,678.05
10 payments; by number, the most common kind was consulting fee; the largest payer was Gilead Sciences, Inc. The 12,335 providers of this specialty with any payment received $953.79 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
- Ies ER Oklahoma LLCTulsa, OK
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Seamus David Lonergan among 7,751 emergency medicine physician records in California
Seamus David Lonergan, 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 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 fileYes · 59% of these records are
- Graduated2003 · median 2011 among the 4,560 with a school on file
- 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.
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
- Susan Bradshaw, MDSan Francisco, CA 941231760465967
- Michael Ching, MDSan Francisco, CA 941231124213541
- Wolf-Eberhard Mehling, MDSan Francisco, CA 941231639169519
- Ward HanSan Francisco, CA 941221629252325
- Johnson Kwan, MDSan Francisco, CA 941221447540067
- Paul RobinsonSan Francisco, CA 941221003351891
- Neda Farzan, MDSan Francisco, CA 941211528383460
- William Coltrin, MDSan Francisco, CA 941201700866613
Common questions
What is Seamus David Lonergan, M.D.'s NPI number?
Seamus David Lonergan, M.D.'s National Provider Identifier (NPI) is 1407953391, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Seamus David Lonergan, M.D. located?
The NPPES record lists a practice address at 3360 Octavia St Apt 6, San Francisco, CA, 94123. Phone: (415) 775-9619. Providers update this record themselves, so call before visiting.
How can I verify Seamus David Lonergan, M.D.'s license?
NPPES lists California license number A90573, 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 Seamus David Lonergan, M.D. prescribe under Medicare Part D?
In 2024, Seamus David Lonergan, M.D. had 196 Medicare Part D claims for 147 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.