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

Mrs. Gillian Marie Williams, PNP

Individual provider Registered Nurse · NPI 1730589169

Mrs. Gillian Marie Williams, PNP is a Registered Nurse in Upland, California. Licensed in California. Registered with an NPI since 2014.

Licensed in
CA
In the registry since
2014
Specialties on file
2
What do these letters mean?
PNP — Pediatric Nurse Practitioner
A nurse practitioner specialising in children.

See every abbreviation used in this directory →

Practice location Address checks out

440 N Mountain Ave Ste 112
Upland, CA 91786-5183
Phone: (909) 931-1313
Fax: (909) 920-3883
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatric Nurse Practitioner (primary) Taxonomy 363LP0200X · Licence 22163 (CA)
Registered Nurse Taxonomy 163W00000X · Licence 664000 (CA)

Record details

NPI number1730589169
Entity typeIndividual (Type 1)
GenderFemale
Credentials PNP
Sole proprietorNo
NPI enumeratedSeptember 4, 2014
Last updated in NPPESSeptember 4, 2014

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