Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Derek Diaz, NP

Individual provider Nurse Practitioner · NPI 1831811157

Derek Diaz, NP is a Nurse Practitioner in Ontario, California. Graduated from Western Un of Hlth Sciences, Col of Podiatric Med in 2022, 4 years ago. Practices with Michael Decker DO, Inc, a 23-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
4
Trained at
Western Un of Hlth Sciences, Col of Podiatric Med
Licensed in
CA
In the registry since
2022
What do these letters mean?
NP — Nurse Practitioner
An advanced practice nurse who can diagnose, treat and in most states prescribe.

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Practice location Address checks out

2821 S Cascades Trl
Ontario, CA 91761-7234
Phone: (909) 732-0197
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 95021897 (CA)

Record details

NPI number1831811157
Entity typeIndividual (Type 1)
GenderMale
Credentials NP
Sole proprietorYes
NPI enumeratedSeptember 13, 2022
Last updated in NPPESSeptember 13, 2022
Certification dateSeptember 13, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolWESTERN UN OF HLTH SCIENCES, COL OF PODIATRIC MED
Graduated 2022 (4 years in practice)
Group practice Michael Decker Do, Inc. — 23 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients429
Services billed 3,659 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Michael Decker DO, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 23 clinicians in the practice; 12 are shown here.

Other providers in Ontario