Loan Huynh
Loan Huynh is a provider specialising in Optometrist in San Diego, CA, registered under NPI 1003454604. 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 Diego, based on OpenStreetMap data collected Sep 28, 2026. Parking is available about 0.32 mi away. The nearest transit stop is 899 ft away, served by Zion Av & 51st St.
Getting here and what is nearby
Grocery Grocery Outlet 124 ft ~1 min
Restaurant Rockets Pizza and Subs 151 ft ~1 min
Restaurant El Rodeo Taco Shop 178 ft ~1 min
5149 Waring Road, San Diego 92120
Restaurant Fosters Freeze 367 ft ~2 min
Transit 474 ft ~2 min
Gas station Arco 470 ft ~2 min
5194 Waring Road, San Diego 92120
Convenience ExtraMile 537 ft ~3 min
5103 Waring Road, San Diego 92120
Gas station Chevron 542 ft ~3 min
5103 Waring Road, San Diego 92120
Transit Zion Av & Waring Rd 585 ft ~3 min
Convenience 7-Eleven 616 ft ~3 min
Transit Zion Av & 51st St 899 ft ~4 min
Parking 962 ft ~4 min
Parking Foster Elementary School Parking Lot 1,007 ft ~4 min
Parking 0.32 mi ~7 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 |
|---|---|---|
| 34472TLG | CA | Optometrist primary |
This provider holds licence 34472TLG 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 Optometrist covers
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system. NUCC Health Care Provider Taxonomy, code 152W00000X
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 | 1003454604 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Dec 13, 2019 |
| Last updated | Dec 13, 2019 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Practice address |
5175 WARING RD San Diego, CA 92120 (619) 583-1000 |
| Mailing address |
11717 CORTE SOSEGADO San Diego, CA 92128 |
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 | 4 | 5 | 4 | 6 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 5 | 8 | 6 | 0 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.