Vivian Yiu
Vivian Yiu is a Behavior Technician in San Ramon, CA, registered under NPI 1003309857.
Getting there
Here is what surrounds this office in San Ramon, based on OpenStreetMap data collected Sep 17, 2026. Parking is available about 0.22 mi away. There is EV charging 950 ft from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 0.27 mi away, served by Crow Canyon Road & Old Crow Canyon Road. A pharmacy sits 0.39 mi from the entrance (Rx Managed Care Reimbursement), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.48 mi away.
Getting here and what is nearby
Parking 464 ft ~2 min
Parking 467 ft ~2 min
Convenience Chevron 600 ft ~3 min
2860 Crow Canyon Road
Convenience Fast & Easy Mart 644 ft ~3 min
2820 Crow Canyon Road
Gas station Chevron 640 ft ~3 min
Gas station Valero 743 ft ~3 min
Transit Crow Canyon Road & Twin Creeks Drive 807 ft ~4 min
Convenience Valero 792 ft ~4 min
2350 San Ramon Valley Boulevard
Hotel Hyatt House 767 ft ~3 min
2323 San Ramon Valley Boulevard, San Ramon 94583
Restaurant Taco Bell Cantina 888 ft ~4 min
2415 San Ramon Valley Boulevard, San Ramon 94583
Restaurant Sakura 919 ft ~4 min
2277 San Ramon Valley Boulevard
EV charging Tesla Supercharger 950 ft ~4 min
Transit San Ramon Valley Boulevard & Crow Canyon Road 0.20 mi ~4 min
Restaurant Chipotle 0.20 mi ~5 min
2421 San Ramon Valley Boulevard, San Ramon 94583
Parking 0.22 mi ~5 min
Coffee Starbucks 0.23 mi ~5 min
2435 San Ramon Valley Boulevard, San Ramon 94583
Transit Crow Canyon Road & Old Crow Canyon Road 0.27 mi ~6 min
Grocery Namaste Plaza Indian Supermarket 0.28 mi ~6 min
Grocery Safeway 0.34 mi ~7 min
2505 San Ramon Valley Boulevard, San Ramon 94583
24/7
Coffee Starbucks 0.36 mi ~8 min
Pharmacy Rx Managed Care Reimbursement 0.39 mi ~8 min
Gas station Shell 0.46 mi ~10 min
3048 Crow Canyon Road
Coffee Starbucks 0.48 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
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 Behavior Technician covers
The behavior technician is a paraprofessional who practices under the close, ongoing supervision of a behavior analyst or assistant behavior analyst certified by the Behavior Analyst Certification Board and/or credentialed by a state (such as through licensure). The behavior technician is primarily responsible for the implementation of components of behavior-analytic treatment plans developed by the supervisor. That may include collecting data on treatment targets and conducting certain types of behavioral assessments (e.g., stimulus preference assessments). The behavior technician does not design treatment or assessment plans or procedures but provides services as assigned by the supervisor responsible for his or her work. NUCC Health Care Provider Taxonomy, code 106S00000X
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 | 1003309857 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 7, 2018 |
| Last updated | Jun 7, 2018 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Practice address |
1 CROW CANYON CT STE 100 San Ramon, CA 94583 (888) 531-8385 |
| Mailing address |
11 MAJESTIC AVE San Francisco, CA 94112 |
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 | 3 | 0 | 9 | 8 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 0 | 9 | 8 | 1 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.