Physician Profile
Unclaimed ProfileAbout DIAZ
Listed in the NPI registry as a nurse practitioner, Derek Diaz, NP practises in Ontario, CA. Derek graduated from Western Un of Hlth Sciences, Col of Podiatric Med in 2022. Medicare claims data shows Derek provided 3,659 services to 730 patients.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Diaz's specialty?
Dr. Diaz is a nurse practitioner in Ontario, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “NURSE PRACTITIONER”.
NPI registry
Where can I find Dr. Diaz?
Dr. Diaz is listed at 2821 S CASCADES TRL, Ontario, CA 91761. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Diaz?
The number on file is (909) 732-0197. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Diaz?
Dr. Diaz's National Provider Identifier is 1831811157. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Diaz's medical education?
Dr. Diaz attended Western Un of Hlth Sciences, Col of Podiatric Med, graduating in 2022. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Diaz have?
Dr. Diaz has 4 years experience. Calculated from a graduation year of 2022, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Diaz known for?
According to Medicare billing data, Dr. Diaz the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Diaz's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Diaz. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (909) 732-0197
- Email not available
Practice Locations
2821 S CASCADES TRL
Ontario, CA 91761
Procedures Most Often Billed to Medicare
3,659 services · 730 patients · 3 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99309 |
3,322 |
| Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more | Office visit | 99306 |
323 |
| Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | Office visit | 99310 |
14 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other nurse practitioners in Ontario 8
Same specialty, same city.
Trained at Western Un of Hlth Sciences, Col of Podiatric Med 2
Other providers in the same specialty who trained at the same institution.
Class of 2022 at Western Un of Hlth Sciences, Col of Podiatric Med 8
Providers who graduated from the same medical school in the same year.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.