SIMSON, WYNN AND WILLIAMS
SIMSON, WYNN AND WILLIAMS is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003165580, based in Fair Oaks, CA. The organization lists 2 taxonomy classifications, with Substance Use Disorder Rehabilitation Clinic/Center recorded as primary.
Getting there
Here is what surrounds this office in Fair Oaks, based on OpenStreetMap data collected Sep 9, 2026. No dedicated parking is recorded within walking distance, so allow extra time to find street parking.
Getting here and what is nearby
Restaurant Petunia's Pizza 500 ft ~2 min
8525 Madison Avenue, Fair Oaks 95628-3855
Th-Su 17:00-20:30
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 Rehabilitation, Substance Use Disorder covers
Definition to come... NUCC Health Care Provider Taxonomy, code 261QR0405X
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 | |
|---|---|---|---|---|
| 261QR0405X | Substance Use Disorder Rehabilitation Clinic/Center Rehabilitation, Substance Use Disorder | — | — | primary |
| 251S00000X | Community/Behavioral Health Agency | — | — |
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 | 1003165580 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Aug 30, 2012 |
| Last updated | Aug 30, 2012 |
| Status | Active |
| Practice address |
7844 MADISON AVE SUITE 106 Fair Oaks, CA 95628 (916) 476-6301 |
| Other names |
Welcome Former Legal Name |
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 | 5 | 5 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 6 | 1 | 5 | 7 |
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.