NPPES file of Aug 9, 2026

Derek Diaz, NP

Nurse Practitioner · Ontario, CA

Derek Diaz, NP is a nurse practitioner with a practice address in Ontario, California, and NPI 1831811157, issued on Sep 13, 2022. Check the license (California 95021897, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1831811157
Name
Derek Diaz
Credential
NP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
95021897 CA
Self-reported in NPPES; status is on the state search
Practice location
2821 S Cascades Trl, Ontario, CA 91761
Phone
(909) 732-0197
Enumerated
Sep 13, 2022
Record last updated
Sep 13, 2022
Medicare enrollment
Enrolled (PECOS I20221215002537); accepts Medicare assignment
Medical or professional school
Western Un Of Hlth Sciences, Col Of Podiatric Med, 2022
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest nurse practitioner records → All 8,223 in California → Look up another NPI →

Verify Derek Diaz 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 95021897    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

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99% fewer Medicare Part D claims than the average nurse practitioner in 2024

13 Medicare Part D claims, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.

  1. Derek Diaz13
  2. Specialty average1,109

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Bills Medicare through one group practice

  1. Michael Decker DO, Inc.Sonoma, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Derek Diaz among 8,223 nurse practitioner records in California

Derek Diaz, NP is one of 8,223 nurse practitioner records with a practice address in California. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 77% of them.

  • NPI issued2022 · 77% of these records are older, 18% newer
  • In a Medicare fileYes · 65% of these records are
  • In the CMS Doctors and Clinicians fileYes · 42% of these records are
  • Graduated2022 · median 2017 among the 3,425 with a school on file
  • Record last updated2022 · 45% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Nurse Practitioner providers in California

There are 8,223 nurse practitioner records in California.

All 8,223 in California → Every provider in Ontario → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Jeanne Jackson, FNPOntario, CA 917611508622150
  2. Hailey LeeOntario, CA 917611043186521
  3. Ana Lemus, FNPOntario, CA 917611932614203
  4. Saquib Mohammed, FNPOntario, CA 917611205380060
  5. Hope Santiago, NPOntario, CA 917611245226000
  6. Stefanie Varela, N.P.Ontario, CA 917611447322672
  7. Vicenta Yasay, NPOntario, CA 917611881889145
  8. Nathali CanedoOntario, CA 917621730967860

Common questions

What is Derek Diaz, NP's NPI number?

Derek Diaz, NP's National Provider Identifier (NPI) is 1831811157, issued on Sep 13, 2022. An NPI identifies a provider in billing; it is not a license.

Where is Derek Diaz, NP located?

The NPPES record lists a practice address at 2821 S Cascades Trl, Ontario, CA, 91761. Phone: (909) 732-0197. Providers update this record themselves, so call before visiting.

How can I verify Derek Diaz, NP's license?

NPPES lists California license number 95021897, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Derek Diaz, NP prescribe under Medicare Part D?

In 2024, Derek Diaz, NP had 13 Medicare Part D claims; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions 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. Medicare files from data.cms.gov. 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.