Duy Nguyen, DO
Duy Nguyen, DO is an Internal Medicine Physician in Tucson, AZ, registered under NPI 1003662230. 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 Tucson, based on OpenStreetMap data collected Oct 13, 2026. Parking is available about 204 ft away. The nearest transit stop is 206 ft away.
Getting here and what is nearby
Transit 174 ft ~1 min
Parking 137 ft ~1 min
Parking 169 ft ~1 min
Transit 193 ft ~1 min
Transit 206 ft ~1 min
Parking 204 ft ~1 min
Gas station Chevron 254 ft ~1 min
Convenience QuikTrip 0.24 mi ~5 min
Gas station QuikTrip 0.24 mi ~5 min
Convenience Shell 0.45 mi ~10 min
Gas station Shell 0.46 mi ~10 min
Restaurant Happy Rooster Cafe 0.46 mi ~10 min
Convenience Circle K 0.49 mi ~10 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 |
|---|---|---|
| R4887 | AZ | Internal Medicine Physician primary |
This provider holds licence R4887 issued in AZ. 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 Internal Medicine covers
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs. NUCC Health Care Provider Taxonomy, code 207R00000X
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 | 1003662230 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 29, 2024 |
| Last updated | Jun 3, 2026 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | DO |
| Practice address |
7901 E 22ND ST Tucson, AZ 85710 (520) 694-8888 Fax (520) 694-8466 |
| Other names |
Dennis Nguyen Doing Business As |
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 | 6 | 6 | 2 | 2 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 6 | 4 | 2 | 6 |
Sum = 50 · next multiple of 10 = 50 · check digit = 0 · actual last digit = 0
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.