John Powell, PH.D.
John Powell, PH.D. is a Clinical Child & Adolescent Psychologist in Rocklin, CA, registered under NPI 1952495020. This provider registers 5 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 5701 LONETREE BLVD STE. 216, Rocklin, CA 95765. 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 |
|---|---|---|
| 23682 | CA | Clinical Child & Adolescent Psychologist primary |
| 23682 | CA | Cognitive & Behavioral Psychologist |
| 23682 | CA | Family Psychologist |
| 23682 | CA | Intellectual & Developmental Disabilities… |
| 23682 | CA | Clinical Psychologist |
This provider holds licence 23682 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 Clinical Child & Adolescent covers
A psychologist who develops and applies scientific knowledge to the delivery of psychological services to infants, toddlers, children and adolescents within their social context. Of particular importance to the specialty of clinical child psychology is an understanding of the basic psychological needs of children and adolescents, and how the family and other social contexts influence the socio-emotional adjustment, cognitive development, behavioral adaptation and health status of children and adolescents. NUCC Health Care Provider Taxonomy, code 103TC2200X
All registered taxonomy codes
This provider registers 5 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103TC2200X | Clinical Child & Adolescent Psychologist Clinical Child & Adolescent | 23682 | CA | primary |
| 103TB0200X | Cognitive & Behavioral Psychologist Cognitive & Behavioral | 23682 | CA | |
| 103TF0000X | Family Psychologist Family | 23682 | CA | |
| 103TM1800X | Intellectual & Developmental Disabilities Psychologist Intellectual & Developmental Disabilities | 23682 | CA | |
| 103TC0700X | Clinical Psychologist Clinical | 23682 | 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 | 1952495020 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 3, 2006 |
| Last updated | Aug 28, 2014 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | PH.D. |
| Practice address |
5701 LONETREE BLVD STE. 216 Rocklin, CA 95765 (916) 342-4077 |
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 | 9 | 5 | 2 | 4 | 9 | 5 | 0 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 1 | 2 | 8 | 9 | 1 | 0 | 4 |
Sum = 60 · next multiple of 10 = 60 · 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.