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

Dr. William B Gregory, MD

Individual provider Emergency Medicine Physician · NPI 1659337350

Dr. William B Gregory, MD is an Emergency Medicine in Pasadena, California. Graduated from Medical University of South Carolina College of Medicine in 1999, 27 years ago. Practices with Third Coast Emergency Physicians Southwest PA, a 35-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
27
Trained at
Medical University of South Carolina College 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

100 W California Blvd
Pasadena, CA 91105-3010
Phone: (626) 397-3445
Fax: (626) 397-5643
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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 A78714 (CA)

Record details

NPI number1659337350
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 22, 2006
Last updated in NPPESJune 13, 2008
Mailing addressPo Box 60259, Los Angeles, CA 90060-0259

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolMEDICAL UNIVERSITY OF SOUTH CAROLINA COLLEGE OF MEDICINE
Graduated 1999 (27 years in practice)
Group practice Third Coast Emergency Physicians Southwest Pa — 35 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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