Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Nathan A Teismann, MD

Individual provider Emergency Medicine Physician · NPI 1548459282

Dr. Nathan A Teismann, MD practises Emergency Medicine in San Francisco, California. Graduated from University of Chicago, Pritzker School of Medicine in 2004, 22 years ago. Practices with San Francisco Emergency Medical Associates, a 72-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
22
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
CA
In the registry since
2007
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

505 Parnassus Ave UCSF Dept OF Emergency Medicine L-126
San Francisco, CA 94143-0208 Not confirmed with CMS for 15 years — call before visiting
Phone: (415) 609-8195
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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 A95888 (CA)

Record details

NPI number1548459282
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 18, 2007
Last updated in NPPESJanuary 13, 2011

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 2004 (22 years in practice)
Group practice San Francisco Emergency Medical Associates — 72 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients419
Services billed 632 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at San Francisco Emergency Medical Associates

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 72 clinicians in the practice; 12 are shown here.

Other providers in San Francisco