SERVICE FIRST OF NORTHERN CALIFORNIA
SERVICE FIRST OF NORTHERN CALIFORNIA is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1437374774, based in Stockton, CA. It is classified under Addiction (Substance Use Disorder) Counselor.
Getting there
The practice address on file is SERVICE FIRST OF NOTHERN CALIFORNIA 1001 N. CENTER/7 W. ACACIA, Stockton, CA 95202. 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 |
|---|---|---|
| 390017BN | CA | Addiction (Substance Use Disorder)… primary |
This provider holds licence 390017BN 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 Addiction (Substance Use Disorder) covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YA0400X
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1437374774 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Apr 13, 2007 |
| Last updated | Sep 22, 2025 |
| Status | Active |
| Practice address |
SERVICE FIRST OF NOTHERN CALIFORNIA 1001 N. CENTER/7 W. ACACIA Stockton, CA 95202 (209) 451-3628 Fax (209) 932-9446 |
| Mailing address |
102 W BIANCHI RD Stockton, CA 95207 |
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 | 4 | 3 | 7 | 3 | 7 | 4 | 7 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 6 | 7 | 6 | 7 | 8 | 7 | 5 |
Sum = 76 · next multiple of 10 = 80 · 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.