Derek Diaz, NP
NPI 1831811157 · Nurse Practitioner · Ontario, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Derek Diaz, NP is a Nurse Practitioner provider in Ontario, CA (NPI 1831811157).
Provider details
- NPI number
- 1831811157
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Male
- Sole proprietor
- Yes
- License
- 95021897 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
3 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,659 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 3,322 | $97 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 323 | $162 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 14 | $138 |
Typical Medicare-allowed amounts for these services range $97–$162 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-09-13
- Last updated
- 2022-09-13
- Certified
- 2022-09-13
Frequently asked questions
- What is Derek Diaz's NPI number?
- Derek Diaz's National Provider Identifier (NPI) is 1831811157, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derek Diaz's specialty?
- Derek Diaz is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Derek Diaz located?
- Derek Diaz's practice location on file with NPPES is 2821 S Cascades Trl, Ontario, CA 91761-7234.
- What is Derek Diaz's phone number?
- The practice phone number listed in the NPPES registry for Derek Diaz is (909) 732-0197.
- Does Derek Diaz accept Medicare?
- Derek Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Derek Diaz's NPI active?
- Yes — Derek Diaz's NPI (1831811157) is active in the NPPES registry as of the last update on 2022-09-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.