Thuydan-darlene Do
Thuydan-darlene Do is a provider specialising in Pharmacy in Fremont, CA, registered under NPI 1003331620. 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 Fremont, based on OpenStreetMap data collected Sep 19, 2026. Parking is available about 707 ft away. The nearest transit stop is 0.22 mi away, served by Blacow Road & Greenpark Drive (Irvington High School). A pharmacy sits 0.00 mi from the entrance (Walgreens), which helps if you leave with a prescription.
Getting here and what is nearby
Pharmacy Walgreens 0.00 mi ~1 min
41400 Blacow Road, Fremont 94538
Restaurant Bronco Billys Pizza Palace 131 ft ~1 min
41200 Blacow Road, Fremont 94538
Parking 242 ft ~1 min
Parking 360 ft ~2 min
Restaurant Maple Leaf Donuts 403 ft ~2 min
Restaurant House of Currys 425 ft ~2 min
Transit Grimmer Boulevard & Blacow Road 569 ft ~3 min
Transit Grimmer Boulevard & Blacow Road 608 ft ~3 min
Gas station True Zero 618 ft ~3 min
Gas station Valero 624 ft ~3 min
Parking 707 ft ~3 min
Transit Blacow Road & Greenpark Drive (Irvington High School) 0.22 mi ~5 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 |
|---|---|---|
| 75178 | CA | Pharmacy primary |
This provider holds licence 75178 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 Pharmacy covers
A facility used by pharmacists for the compounding and dispensing of medicinal preparations and other associated professional and administrative services. A pharmacy is a facility whose primary function is to store, prepare and legally dispense prescription drugs under the professional supervision of a licensed pharmacist. It meets any licensing or certification standards set forth by the jurisdiction where it is located. NUCC Health Care Provider Taxonomy, code 333600000X
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 | 1003331620 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 4, 2017 |
| Last updated | Nov 24, 2021 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Practice address |
41400 BLACOW RD Fremont, CA 94538 (510) 440-8195 |
| Mailing address |
2844 SCHOONER CT San Jose, CA 95148 |
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 | 3 | 1 | 6 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 3 | 2 | 6 | 4 |
Sum = 50 · next multiple of 10 = 50 · check digit = 0 · actual last digit = 0
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.