Junyao Xu, OD
Junyao Xu, OD is a provider specialising in Optometrist in Fontana, CA, registered under NPI 1003583063.
Getting there
Here is what surrounds this office in Fontana, based on OpenStreetMap data collected Oct 8, 2026. Parking is available about 0.46 mi away at Fontana Metrolink Plaza. There is EV charging 0.49 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 878 ft away, served by Juniper @ Arrow Northbound. If you arrive early, there is a coffee shop 0.43 mi away.
Getting here and what is nearby
Transit Juniper @ Upland Southbound 209 ft ~1 min
Parking 286 ft ~2 min
Transit Juniper @ Upland Northbound 402 ft ~2 min
Parking 667 ft ~3 min
Transit Juniper @ Arrow Northbound 878 ft ~4 min
EV charging Blink 0.20 mi ~5 min
Convenience Shell 0.20 mi ~4 min
Convenience 7-Eleven 0.21 mi ~5 min
Gas station Shell 0.21 mi ~5 min
Restaurant pho saigon 0.22 mi ~5 min
Grocery Stater Bros. 0.24 mi ~5 min
8228 Sierra Avenue, Fontana 92335
Mo-Su 06:00-23:00
Restaurant Charley's Burgers 0.28 mi ~6 min
Restaurant Tacos Xalisco 0.31 mi ~7 min
8188 Sierra Avenue, Fontana 92335
Coffee The Bookmark Cafe Bar 0.32 mi ~7 min
8437 Sierra Avenue, Fontana 92335
EV charging ChargePoint 0.33 mi ~7 min
Gas station Mobil 0.40 mi ~9 min
Coffee Starbucks 0.43 mi ~9 min
Gas station Circle K 0.44 mi ~9 min
Convenience Circle K 0.46 mi ~10 min
Parking Fontana Metrolink Plaza 0.46 mi ~10 min
EV charging 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 |
|---|---|---|
| 34878 | CA | Optometrist primary |
This provider holds licence 34878 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 - Optometry
- PAC ID
- 3678958469
- Enrollment ID
- I20220914003193
Medicare enrolment is recorded as approved under the provider type Practitioner - Optometry. 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 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 | 1003583063 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 26, 2021 |
| Last updated | Aug 26, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | OD |
| Practice address |
8381 JUNIPER AVE UNIT 100 Fontana, CA 92335 (909) 428-2020 |
| Mailing address |
18661 AGUIRO ST Rowland Heights, CA 91748 |
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 | 5 | 8 | 3 | 0 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 8 | 6 | 0 | 3 |
Sum = 47 · next multiple of 10 = 50 · check digit = 3 · actual last digit = 3
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.