Shuinn Chang, NP
Shuinn Chang, NP is a Nurse Practitioner in Oakley, CA, registered under NPI 1003249244. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Oakley, based on OpenStreetMap data collected Sep 14, 2026. Parking is available about 0.33 mi away. There is EV charging 556 ft from the office — useful if you are driving in from out of town. The nearest transit stop is 0.36 mi away, served by Main Street & Genesco Street.
Getting here and what is nearby
Transit Main Street & Big Break Road 174 ft ~1 min
EV charging 556 ft ~3 min
Transit Main Street & Big Break Road 618 ft ~3 min
Parking 0.22 mi ~5 min
Parking 0.26 mi ~6 min
Parking 0.33 mi ~7 min
Transit Main Street & Genesco Street 0.36 mi ~8 min
Convenience 7-Eleven 0.48 mi ~10 min
Gas station 7-Eleven 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 |
|---|---|---|
| 843213 | CA | Registered Nurse |
| 23680 | CA | Nurse Practitioner primary |
This provider holds licence 843213 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 Nurse Practitioner covers
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners. NUCC Health Care Provider Taxonomy, code 363L00000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 163W00000X | Registered Nurse | 843213 | CA | |
| 363L00000X | Nurse Practitioner | 23680 | CA | primary |
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 | 1003249244 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 12, 2013 |
| Last updated | Sep 24, 2013 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | NP |
| Practice address |
2021 MAIN ST Oakley, CA 94561 (925) 776-8200 Fax (510) 535-4225 |
| Mailing address |
PO BOX 22210 Oakland, CA 94623 |
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 | 2 | 4 | 9 | 2 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 4 | 9 | 2 | 8 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.