ALLEN IVES ARIEFF, MD, INC
ALLEN IVES ARIEFF, MD, INC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003123555, based in San Leandro, CA. It is classified under Nephrology Physician.
Getting there
Here is what surrounds this office in San Leandro, based on OpenStreetMap data collected Sep 6, 2026. Parking is available about 0.23 mi away. The nearest transit stop is 509 ft away, served by East 14th Street & 141st Avenue. A pharmacy sits 728 ft from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 608 ft away.
Getting here and what is nearby
Transit East 14th Street & 141st Avenue 420 ft ~2 min
Transit San Leandro Hospital 481 ft ~2 min
Transit East 14th Street & 141st Avenue 509 ft ~2 min
Coffee Starbucks 608 ft ~3 min
Parking 648 ft ~3 min
Restaurant Popeyes 615 ft ~3 min
13808 East 14th Street, San Leandro 94578
10:00-22:00
Pharmacy Walgreens 728 ft ~3 min
Convenience 7-Eleven 841 ft ~4 min
Parking 856 ft ~4 min
Parking 0.23 mi ~5 min
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 |
|---|---|---|
| G17509 | CA | Nephrology Physician primary |
This provider holds licence G17509 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
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
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1003123555 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Sep 4, 2010 |
| Last updated | Sep 4, 2010 |
| Status | Active |
| Practice address |
13939 E 14TH ST STE 170 San Leandro, CA 94578 (310) 433-3038 Fax (415) 332-1205 |
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 | 1 | 2 | 3 | 5 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 2 | 6 | 5 | 1 |
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.