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

Gerald Roy Nazareno, MD

Individual provider Emergency Medicine Physician · NPI 1679564983

Gerald Roy Nazareno, MD is an Emergency Medicine in Pleasanton, California. Qualified in 1987, 39 years ago. Practices with Pleasanton Emergency Medical Group, a 38-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
39
Licensed in
CA
In the registry since
2005
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

5555 W Las Positas Blvd
Pleasanton, CA 94588-4000
Phone: (209) 342-2300
Fax: (209) 524-4240
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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 A53590 (CA)

Record details

NPI number1679564983
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 4, 2005
Last updated in NPPESJuly 13, 2026

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 1987 (39 years in practice)
Group practice Pleasanton Emergency Medical Group — 38 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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