Harry Nguyen, D.O.
Harry Nguyen, D.O. is a Hepatology Physician in Orange, CA, registered under NPI 1003277930. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Orange, based on OpenStreetMap data collected Aug 30, 2026. Parking is available about 0.41 mi away. There is EV charging 0.36 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 0.24 mi away, served by Chapman-The City. If you arrive early, there is a coffee shop 0.38 mi away.
Getting here and what is nearby
Parking 295 ft ~2 min
Parking 349 ft ~2 min
Restaurant WaBa Grill 510 ft ~2 min
3070 West Chapman Avenue, Orange 92868
Restaurant Pita Grill 510 ft ~2 min
3070 West Chapman Avenue, Orange 92868
Mo-Fr 10:30-20:00; Sa 11:00-18:00; Su off
Restaurant Tacos La Calle 512 ft ~2 min
3070 West Chapman Avenue, Orange 92868
Su-Th 11:00-21:00; Fr,Sa 11:00-22:00
Transit Chapman-Renaissance 741 ft ~3 min
Coffee Kelly's Coffee 758 ft ~3 min
Transit Chapman-Renaissance 775 ft ~3 min
Transit Chapman-The City 0.24 mi ~5 min
Hotel Hotel Fera Anaheim, a DoubleTree by Hilton Hotel 0.30 mi ~6 min
Hotel ALO Hotel 0.33 mi ~7 min
Hotel Ayres Hotel Orange 0.34 mi ~7 min
EV charging 0.36 mi ~8 min
Coffee Starbucks 0.38 mi ~8 min
3743 West Chapman Avenue, Orange 92868
Mo-Th 04:00-22:00; Fr 04:00-23:30; Sa 04:00-00:00; Su 05:00-22:30
Parking 0.41 mi ~9 min
333 South Anita Drive, Orange 92868
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 |
|---|---|---|
| 20A21145 | CA | Hepatology Physician primary |
| 20A21145 | CA | Internal Medicine Physician |
| 20A21145 | CA | Gastroenterology Physician |
This provider holds licence 20A21145 issued in CA. 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 - Gastroenterology
- PAC ID
- 9133410491
- Enrollment ID
- I20230724003242
Medicare enrolment is recorded as approved under the provider type Practitioner - Gastroenterology. 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 Hepatology covers
The discipline of Hepatology encompasses the structure, function, and diseases of the liver and biliary tract. The American Board of Internal Medicine considers Hepatology part of the subspecialty of gastroenterology. Physicians who identify themselves as Hepatologists usually, but not always, have been trained in gastrointestinal programs. NUCC Health Care Provider Taxonomy, code 207RI0008X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RI0008X | Hepatology Physician Hepatology | 20A21145 | CA | primary |
| 207R00000X | Internal Medicine Physician | 20A21145 | CA | |
| 207RG0100X | Gastroenterology Physician Gastroenterology | 20A21145 | CA |
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 | 1003277930 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 20, 2016 |
| Last updated | Jan 23, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | D.O. |
| Practice address |
101 THE CITY DR S Orange, CA 92868 (714) 456-7002 |
| Mailing address |
101 THE CITY DR S BLDG 22C Orange, CA 92868 |
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 | 2 | 7 | 7 | 9 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 7 | 5 | 9 | 6 |
Sum = 60 · next multiple of 10 = 60 · 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.