Aaron Jeng, MD, MPH
Aaron Jeng, MD, MPH is an Internal Medicine Physician in San Gabriel, CA, registered under NPI 1003053851. 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 Gabriel, based on OpenStreetMap data collected Sep 2, 2026. Parking is available about 0.22 mi away. The nearest transit stop is 0.21 mi away, served by Metro 78. A pharmacy sits 526 ft from the entrance (Lucky Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.29 mi away.
Getting here and what is nearby
Parking 275 ft ~2 min
Parking 363 ft ~2 min
Transit Metro 78 502 ft ~2 min
Pharmacy Lucky Pharmacy 526 ft ~2 min
416 West Las Tunas Drive, San Gabriel 91776
Restaurant Newport Seafood 535 ft ~3 min
Transit Metro 78 587 ft ~3 min
Restaurant Carl's Jr. 642 ft ~3 min
505 West Las Tunas Drive, San Gabriel 91776
24/7
Restaurant Domino's 703 ft ~3 min
413 West Las Tunas Drive, San Gabriel 91776
Mo-Th 10:30-24:00; Fr-Sa 10:30-01:00; Su 10:30-24:00
Grocery Mitsuwa Marketplace 700 ft ~3 min
515 West Las Tunas Drive, San Gabriel 91776
09:00-20:00
Transit Metro 78 0.21 mi ~5 min
Parking 0.22 mi ~5 min
||"no overnite"
Coffee Half & Half Good Old Time 0.25 mi ~5 min
Coffee Love to Go 0.27 mi ~6 min
307 South Mission Drive, San Gabriel 91776
Convenience Taiwan & More 0.28 mi ~6 min
710 West Las Tunas Drive, San Gabriel 91776
Tu-Th 11:00-18:00; Fr,Sa 11:00-19:00; Su 11:00-16:00; Mo off
Coffee Factory Tea Bar 0.29 mi ~6 min
323 South Mission Drive, San Gabriel 91776
Mo-Th,Su 12:00-23:00; Fr-Sa 12:00-02:00
Convenience 7-Eleven 0.34 mi ~7 min
Gas station 76 0.39 mi ~8 min
Convenience Food Mart 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 |
|---|---|---|
| A106414 | CA | Internal Medicine Physician primary |
This provider holds licence A106414 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 - Internal Medicine
- PAC ID
- 1658567524
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| California | I20101118000647 | Practitioner - Internal Medicine |
| Texas | I20251106001943 | Practitioner - Internal Medicine |
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. There are 2 separate enrolment records across 2 states (CA, TX). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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 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 | 1003053851 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 15, 2009 |
| Last updated | Aug 5, 2015 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | MD, MPH |
| Practice address |
438 W LAS TUNAS DR San Gabriel, CA 91776 (626) 289-5454 |
| Mailing address |
PO BOX 5801 Pasadena, CA 91117 |
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 | 5 | 3 | 8 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 5 | 6 | 8 | 1 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
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.