Josefino Diaz
NPI 1891723599 · Internal Medicine Physician · Duluth, MN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Josefino Diaz is a Internal Medicine Physician provider in Duluth, MN (NPI 1891723599).
Provider details
- NPI number
- 1891723599
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 44952 (MN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
291 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 168 | $91 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 40 | $147 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 39 | $173 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 24 | $126 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 20 | $147 |
Typical Medicare-allowed amounts for these services range $91–$173 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 79 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 391 | 137 |
| Amlodipine Besylate | 213 | 73 |
| Lisinopril | 205 | 76 |
| Omeprazole | 179 | 60 |
| Metformin Hcl | 135 | 34 |
| Levothyroxine Sodium | 128 | 38 |
| Apixaban |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-29
- Last updated
- 2020-06-22
- Certified
- 2020-06-22
Frequently asked questions
- What is Josefino Diaz's NPI number?
- Josefino Diaz's National Provider Identifier (NPI) is 1891723599, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Josefino Diaz's specialty?
- Josefino Diaz is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Josefino Diaz located?
- Josefino Diaz's practice location on file with NPPES is 400 E 3rd St, Duluth, MN 55805-1951.
- What is Josefino Diaz's phone number?
- The practice phone number listed in the NPPES registry for Josefino Diaz is (218) 786-8364.
- Does Josefino Diaz accept Medicare?
- Josefino Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Josefino Diaz's NPI active?
- Yes — Josefino Diaz's NPI (1891723599) is active in the NPPES registry as of the last update on 2020-06-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.