NPPES file of Aug 9, 2026

Gillian Marie Williams, PNP

Pediatric Nurse Practitioner · Upland, CA

Gillian Marie Williams, PNP is a pediatric nurse practitioner with a practice address in Upland, California, and NPI 1730589169, issued on Sep 4, 2014. Check the license (California 22163, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1730589169
Name
Gillian Marie Williams
Credential
PNP
Primary taxonomy
Pediatric Nurse Practitioner 363LP0200X
License numbers
22163 CA
664000 CA
Self-reported in NPPES; status is on the state search
Practice location
440 N Mountain Ave, Upland, CA 91786
Phone
(909) 931-1313
Enumerated
Sep 4, 2014
Record last updated
Sep 4, 2014 (not updated in 12 years: call before relying on the address or phone)
Fax
(909) 920-3883
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest pediatric nurse practitioner records → All 1,580 in California → Look up another NPI →

Also registered at 440 N Mountain Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Bradley Ching, DDSGeneral Practice Dentistry1871999227
  2. Daniel Kunihira, DDSPeriodontics1447380605
  3. Mark Kunihira, D.D.S.Periodontics1164688875
  4. Sheila Marshall, LMFTMarriage & Family Therapist1982747283
  5. Samish Patel, M.D.Internal Medicine Physician1427480524
  6. Robin Su, D.D.S.Dentist1649276155

Verify Gillian Marie Williams in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 22163    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Gillian Marie Williams among 1,580 pediatric nurse practitioner records in California

Gillian Marie Williams, PNP is one of 1,580 pediatric nurse practitioner records with a practice address in California. 34% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2014, is newer than 54% of them.

  • NPI issued2014 · 54% of these records are older, 42% newer
  • In a Medicare fileNo · 34% of these records are
  • In the CMS Doctors and Clinicians fileNo · 6% of these records are
  • Record last updated2014 · 63% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LP0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pediatric Nurse Practitioner providers in California

There are 1,580 pediatric nurse practitioner records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,580 in California → Every provider in Upland → Pediatric Nurse Practitioner nationwide →

The 8 pediatric nurse practitioner records with the nearest ZIP codes

  1. Eun Jung KimWalnut, CA 917891235867961
  2. Jettele Joy Lara, FNP-CWest Covina, CA 917901043931629
  3. Stacey WuTemple City, CA 917801336630953
  4. Yin-Tai Hsu, NPSan Gabriel, CA 917761073152773
  5. Ashley Blayton, CPNPSan Dimas, CA 917731871058636
  6. Rebecca ByerSan Dimas, CA 917731952149288
  7. Lana Madanat, MSN, RN, CPNPSan Dimas, CA 917731144622507
  8. Gia Han NguyenSan Dimas, CA 917731114688876

Common questions

What is Gillian Marie Williams, PNP's NPI number?

Gillian Marie Williams, PNP's National Provider Identifier (NPI) is 1730589169, issued on Sep 4, 2014. An NPI identifies a provider in billing; it is not a license.

Where is Gillian Marie Williams, PNP located?

The NPPES record lists a practice address at 440 N Mountain Ave, Upland, CA, 91786. Phone: (909) 931-1313. Providers update this record themselves, so call before visiting.

How can I verify Gillian Marie Williams, PNP's license?

NPPES lists California license number 22163, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.