Priscilla Sewak, RN, BSN
Priscilla Sewak, RN, BSN is an Ambulatory Women's Health Care Registered Nurse in Oakland, CA, registered under NPI 1083400873. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 1411 E 31ST ST # K-6, Oakland, CA 94602. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 95314734 | CA | Ambulatory Women's Health Care Registered… primary |
| 95314734 | CA | Inpatient Obstetric Registered Nurse |
This provider holds licence 95314734 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 Women's Health Care, Ambulatory covers
Definition to come... NUCC Health Care Provider Taxonomy, code 163WW0101X
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 | |
|---|---|---|---|---|
| 163WW0101X | Ambulatory Women's Health Care Registered Nurse Women's Health Care, Ambulatory | 95314734 | CA | primary |
| 163WX0003X | Inpatient Obstetric Registered Nurse Obstetric, Inpatient | 95314734 | CA |
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 | 1083400873 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 17, 2025 |
| Last updated | Apr 17, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | RN, BSN |
| Practice address |
1411 E 31ST ST # K-6 Oakland, CA 94602 (510) 437-6478 Fax (510) 436-5173 |
| Mailing address |
5407 HOMEWOOD WAY Riverbank, CA 95367 |
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 | 8 | 3 | 4 | 0 | 0 | 8 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 7 | 3 | 8 | 0 | 0 | 8 | 5 |
Sum = 57 · next multiple of 10 = 60 · 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.