Sen-siang Ong
Sen-siang Ong is a Behavior Technician in Hayward, CA, registered under NPI 1003400599.
Getting there
Here is what surrounds this office in Hayward, based on OpenStreetMap data collected Sep 24, 2026. Parking is available about 0.32 mi away. The nearest transit stop is 613 ft away, served by B Street & Foothill Boulevard. A pharmacy sits 657 ft from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.41 mi away.
Getting here and what is nearby
Transit B Street & 2nd Street 6 ft ~1 min
Transit 2nd Street & B Street 281 ft ~2 min
Restaurant Haha Sushi Ramen 394 ft ~2 min
22560 Foothill Boulevard, Hayward 94541
Convenience Food Shop 577 ft ~3 min
22690 Foothill Boulevard
Restaurant Hinata Sushi 556 ft ~3 min
Mo-Su 11:30-21:30
Restaurant Siam Palace 559 ft ~3 min
22545 Foothill Boulevard, Hayward
Transit B Street & Foothill Boulevard 613 ft ~3 min
Gas station Valero 642 ft ~3 min
Pharmacy CVS Pharmacy 657 ft ~3 min
22501;22519 Foothill Boulevard
Parking 815 ft ~4 min
22631;22695 Foothill Boulevard
Coffee The Early Bird Coffee 0.27 mi ~6 min
Parking 0.30 mi ~6 min
22301 Foothill Boulevard
Coffee Starbucks 0.32 mi ~7 min
Parking 0.32 mi ~7 min
D Street, Hayward 94541
Convenience FoodMart 0.35 mi ~7 min
838;898 A Street
Grocery Safeway 0.38 mi ~8 min
22280 Foothill Boulevard, Hayward 94541
06:00-01:00
Grocery Lucky 0.40 mi ~8 min
Coffee Sivan's Cafe 0.41 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
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 | 1003400599 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 24, 2021 |
| Last updated | Feb 24, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Practice address |
1180 B ST Hayward, CA 94541 (855) 223-7123 |
| Mailing address |
16782 VON KARMAN AVE STE 11 Irvine, CA 92606 |
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 | 0 | 0 | 5 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 0 | 0 | 5 | 9 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.