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

Guillermo Castillo MD Inc

Organization Family Medicine Physician · NPI 1740413897

Guillermo Castillo MD Inc provides Family Medicine Physician services 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 Not confirmed with CMS for 13 years — call before visiting
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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