T. NGUYEN, DDS, CORPORATION
T. NGUYEN, DDS, CORPORATION is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003005349, based in Hercules, CA. It is classified under Preferred Provider Organization.
Getting there
Here is what surrounds this office in Hercules, based on OpenStreetMap data collected Aug 28, 2026. Parking is available about 0.23 mi away. There is EV charging 0.23 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 0.20 mi away, served by 825 Alfred Nobel Drive. If you arrive early, there is a coffee shop 0.40 mi away.
Getting here and what is nearby
Transit Alfred Nobel Drive & John Muir Parkway 20 ft ~1 min
Transit Alfred Nobel Drive & John Muir Parkway 73 ft ~1 min
Parking 247 ft ~1 min
Transit 825 Alfred Nobel Drive 0.20 mi ~4 min
Parking 0.20 mi ~5 min
EV charging 0.23 mi ~5 min
Parking 0.23 mi ~5 min
Grocery Safeway 0.26 mi ~6 min
Coffee Peet's Coffee 0.31 mi ~7 min
Convenience Safeway Convenience Store 0.33 mi ~7 min
Gas station Safeway Fuel Station 0.34 mi ~7 min
Gas station Shell 0.36 mi ~8 min
Coffee Starbucks 0.40 mi ~8 min
Restaurant Jack in the Box 0.40 mi ~9 min
Restaurant Extreme Pizza 0.40 mi ~9 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 |
|---|---|---|
| 46659 | CA | Preferred Provider Organization primary |
This provider holds licence 46659 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 Preferred Provider Organization covers
A group of physicians and/or hospitals who contract with an employer to provide services to their employees. In a PPO, the patient may got to the physician of his/her choice, even if that physician does not participate in the PPO, but the patient receives care at a lower benefit level. NUCC Health Care Provider Taxonomy, code 305R00000X
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 | 1003005349 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Oct 23, 2007 |
| Last updated | Apr 5, 2012 |
| Status | Active |
| Practice address |
500 ALFRED NOBEL DR 285 Hercules, CA 94547 (510) 741-7041 Fax (510) 803-5200 |
| Mailing address |
PO BOX 1695 PO BOX1695 West Sacramento, CA 95691 |
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 | 0 | 5 | 3 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 0 | 1 | 3 | 8 |
Sum = 41 · next multiple of 10 = 50 · check digit = 9 · actual last digit = 9
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.