Matthew Duff
NPI 1558909226 · Family Nurse Practitioner · Redlands, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Duff is a Family Nurse Practitioner provider in Redlands, CA (NPI 1558909226).
Provider details
- NPI number
- 1558909226
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Male
- Sole proprietor
- No
- License
- 95013312 (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 tenure33% of score
6 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 152 | 73 |
| Losartan Potassium | 100 | 46 |
| Amlodipine Besylate | 82 | 41 |
| Levothyroxine Sodium | 81 | 39 |
| Metformin Hcl | 80 | 39 |
| Lisinopril | 66 | 28 |
| Simvastatin | 58 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$16 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1113 Alta Ave Ste 220Upland, CA 91786-2803Phone: (909) 985-1908
Registry dates
- Enumerated
- 2019-12-12
- Last updated
- 2025-11-16
- Certified
- 2025-11-16
Frequently asked questions
- What is Matthew Duff's NPI number?
- Matthew Duff's National Provider Identifier (NPI) is 1558909226, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Duff's specialty?
- Matthew Duff is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Matthew Duff located?
- Matthew Duff's practice location on file with NPPES is 2 W Fern Ave, Redlands, CA 92373-5916.
- What is Matthew Duff's phone number?
- The practice phone number listed in the NPPES registry for Matthew Duff is (909) 335-4102.
- Does Matthew Duff accept Medicare?
- Matthew Duff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Duff's NPI active?
- Yes — Matthew Duff's NPI (1558909226) is active in the NPPES registry as of the last update on 2025-11-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.