Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Seamus David Lonergan, MD

Individual provider Emergency Medicine Physician · NPI 1407953391

Seamus David Lonergan, MD is an Emergency Medicine in San Francisco, California. Graduated from University of California, San Francisco School of Medicine in 2003, 23 years ago. Practices with Ies ER Oklahoma LLC, a 128-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
23
Trained at
University of California, San Francisco School of Medicine
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3360 Octavia St Apt 6
San Francisco, CA 94123-2224
Phone: (415) 775-9619
Fax: (415) 775-9619
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A90573 (CA)

Record details

NPI number1407953391
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 20, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, SAN FRANCISCO SCHOOL OF MEDICINE
Graduated 2003 (23 years in practice)
Group practice Ies Er Oklahoma Llc — 128 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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