Antonio Diaz Hernandez, MD
Antonio Diaz Hernandez, MD is a Nephrology Physician in San Juan, PR, registered under NPI 1003016775. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in San Juan, based on OpenStreetMap data collected Aug 29, 2026. Parking is available about 0.29 mi away. The nearest transit stop is 876 ft away, served by PR-16 (Blvd. Román Baldorioty de Castro) & PR-1 (Exp. Luis Muñoz Rivera). A pharmacy sits 0.38 mi from the entrance (Caribbean Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.47 mi away.
Getting here and what is nearby
Restaurant Sizzler 474 ft ~2 min
Transit C. Luis Armando Lozada Cruz "Vico C" & PR-1 (Av. Manuel Fernández Juncos) 702 ft ~3 min
Transit C. Luis Armando Lozada Cruz "Vico C" & PR-1 (Av. Manuel Fernández Juncos) 837 ft ~4 min
Transit PR-16 (Blvd. Román Baldorioty de Castro) & PR-1 (Exp. Luis Muñoz Rivera) 876 ft ~4 min
Restaurant LongHorn Steakhouse 0.20 mi ~4 min
Boulevard Román Baldorioty de Castro, San Juan 00907
Restaurant Olive Garden 0.21 mi ~5 min
Boulevard Román Baldorioty de Castro, San Juan 00907
Hotel Hyatt House San Juan 0.23 mi ~5 min
615 Ave Fernandez Juncos Distrito de Convenciones, San Juan 00907
Parking 0.24 mi ~5 min
Calle Axtmeyer, San Juan 00907
Hotel Hotel Miramar 0.26 mi ~6 min
Hotel Caribe Hilton 0.26 mi ~6 min
Parking 0.27 mi ~6 min
Calle Arecibo, San Juan 00907
Parking 0.29 mi ~6 min
551 Calle Salva
Coffee Starbucks 0.30 mi ~6 min
Grocery Pueblo 0.35 mi ~7 min
670 Avenida Juan Ponce de León, San Juan 00907
Mo-Sa 06:00-21:30, Su 07:00-21:30
Pharmacy Caribbean Pharmacy 0.38 mi ~8 min
Convenience Viaggi Grab-'N-Go 0.40 mi ~9 min
Coffee Starbucks 0.43 mi ~9 min
Coffee Macchiato Coffe Shop 0.47 mi ~10 min
654 Avenida Fernández Juncos, San Juan
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 26095 | PR | Internal Medicine Physician |
| 17173 | PR | Nephrology Physician primary |
This provider holds licence 26095 issued in PR. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Nephrology
- PAC ID
- 7113050956
- Enrollment ID
- I20100730000851
Medicare enrolment is recorded as approved under the provider type Practitioner - Nephrology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Nephrology covers
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation. NUCC Health Care Provider Taxonomy, code 207RN0300X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | 26095 | PR | |
| 207RN0300X | Nephrology Physician Nephrology | 17173 | PR | primary |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003016775 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 20, 2007 |
| Last updated | Oct 26, 2022 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | MD |
| Practice address |
1492 AVE LA CONSTITUCION SUITE 717 EDIFICIO CENTRO EUROPA San Juan, PR 00907 (787) 723-5017 |
| Mailing address |
LA SIERRA DEL RIO 300 AVE LA SIERRA BOX 23 San Juan, PR 00926 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 0 | 1 | 6 | 7 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 1 | 3 | 7 | 5 |
Sum = 45 · next multiple of 10 = 50 · check digit = 5 · actual last digit = 5
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.