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

Dr. Gemma Guillermo, MD

Individual provider Psychiatry Physician · NPI 1831154418

Dr. Gemma Guillermo, MD is a Psychiatry in Redwood City, California. Graduated from Js Weill Medical College, Cornell University in 1995, 31 years ago. Practices with County of Santa Clara, a 993-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
31
Trained at
Js Weill Medical College, Cornell University
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

170 Alameda De Las Pulgas 1EAST Sequoia Hospital
Redwood City, CA 94062-2799
Phone: (650) 367-5559
Fax: (650) 368-3754
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 61066 (CA)

Record details

NPI number1831154418
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 18, 2006
Last updated in NPPESFebruary 13, 2019

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolJS WEILL MEDICAL COLLEGE, CORNELL UNIVERSITY
Graduated 1995 (31 years in practice)
Group practice County Of Santa Clara — 993 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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