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

Sean O. Henderson, MD

Individual provider Emergency Medicine Physician · NPI 1205887064

Sean O. Henderson, MD practises Emergency Medicine in Los Angeles, California. Qualified in 1989, 37 years ago. Practices with Em Alliance California APC, a 70-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
37
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

1200 N State St Rm 1011
Los Angeles, CA 90033-1029 Not confirmed with CMS for 19 years — call before visiting
Phone: (323) 226-6667
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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 G69803 (CA)

Record details

NPI number1205887064
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 15, 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 schoolOTHER
Graduated 1989 (37 years in practice)
Group practice Em Alliance California Apc — 70 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 patients311
Services billed 377 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 Em Alliance California APC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 70 clinicians in the practice; 12 are shown here.

Other providers in Los Angeles