Vivian Lo, PA-C
Vivian Lo, PA-C is a Physician Assistant in Concord, CA, registered under NPI 1003167453.
Getting there
Here is what surrounds this office in Concord, based on OpenStreetMap data collected Sep 9, 2026. Parking is available about 622 ft away. There is EV charging 904 ft from the office — useful if you are driving in from out of town. The nearest transit stop is 795 ft away, served by East Street & Willow Pass Road. A pharmacy sits 0.37 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.31 mi away.
Getting here and what is nearby
Parking 469 ft ~2 min
Parking 598 ft ~3 min
Parking 622 ft ~3 min
Transit Salvio Street & Date Street 749 ft ~3 min
Transit Colfax Street & Pacheco Street 764 ft ~3 min
Transit East Street & Willow Pass Road 795 ft ~4 min
EV charging 904 ft ~4 min
Restaurant The Best Little Donut House in Town 0.22 mi ~5 min
1821 East Street, Concord 94520
Mo-Fr 05:00-13:30; Sa-Su 06:00-13:30
Restaurant Uncle Jay Burger House 0.22 mi ~5 min
Grocery Safeway 0.22 mi ~5 min
Restaurant Taqueria Los Gallos 0.23 mi ~5 min
Coffee Bay Leaf Cafe 0.25 mi ~6 min
2123 Pacheco Street
Convenience Concord Mini Mart 0.25 mi ~6 min
2115 Pacheco Street, Concord 94520
Gas station Super Liquor and Gas 0.25 mi ~5 min
Coffee Peet's Coffee 0.30 mi ~7 min
Coffee Starbucks 0.31 mi ~7 min
Convenience Concord Smog & Gas 0.36 mi ~8 min
Mo-Fr 08:00-18:00
Gas station Mobil 0.36 mi ~8 min
PH,Mo-Su 05:00-24:00
Gas station Chevron 0.36 mi ~8 min
2001 Willow Pass Road, Concord 94520
Pharmacy CVS Pharmacy 0.37 mi ~8 min
Convenience Discount Cigarettes 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
| Licence | State | Specialty |
|---|---|---|
| PA22434 | CA | Physician Assistant primary |
This provider holds licence PA22434 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 - Physician Assistant
- PAC ID
- 9234355991
- Enrollment ID
- I20140801001407
Medicare enrolment is recorded as approved under the provider type Practitioner - Physician Assistant. 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 Physician Assistant covers
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician. NUCC Health Care Provider Taxonomy, code 363A00000X
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 | 1003167453 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 25, 2012 |
| Last updated | Sep 25, 2012 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | PA-C |
| Practice address |
2481 PACHECO ST Concord, CA 94520 (925) 680-8933 |
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 | 1 | 6 | 7 | 4 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 6 | 5 | 4 | 1 |
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.