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

Guillermo Castillo MD Inc

Organization Family Medicine Physician · NPI 1740413897

Guillermo Castillo MD Inc is a Family Medicine Physician in San Diego, California. Registered with an NPI since 2009.

In the registry since
2009
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

5550 University Ave
San Diego, CA 92105-2307
Phone: (619) 823-1947
Fax: (800) 334-1041
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X

Record details

NPI number1740413897
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Guillermo Castillo — President/Owner · (619) 823-1947
NPI enumeratedAugust 24, 2009
Last updated in NPPESJanuary 2, 2013
Mailing addressPo Box 511346, Los Angeles, CA 90051-7901

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