Jonathan Porteus, PHD
Jonathan Porteus, PHD is a Group Psychotherapy Psychologist in Sacramento, CA, registered under NPI 1558400796. This provider registers 5 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 8912 VOLUNTEER LN STE 100, Sacramento, CA 95826. 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 |
|---|---|---|
| PSY19635 | CA | Group Psychotherapy Psychologist primary |
| PSY19635 | CA | Counseling Psychologist |
| 14792 | NY | Counseling Psychologist |
| 14792 | NY | Clinical Psychologist |
| PSY19635 | CA | Clinical Psychologist |
| 14792 | NY | Addiction (Substance Use Disorder)… |
| PSY19635 | CA | Addiction (Substance Use Disorder)… |
| 14792 | NY | Psychologist |
| PSY19635 | CA | Psychologist |
| 14792 | NY | Group Psychotherapy Psychologist |
Licences are recorded in 2 states: CA, NY. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
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.
Licensed in 2 states
This provider holds licences in 2 states: California and New York. The practice address on file is in Sacramento, CA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- PSY19635
- Specialty
- Group Psychotherapy Psychologist
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Group Psychotherapy covers
A psychologist who specializes in group psychology and group psychotherapy that is an evidenced-based specialty that prepares group leaders to identify and capitalize on developmental and healing possibilities embedded in the interpersonal/intrapersonal functioning of individual group members as well as collectively for the group. Emphasis is placed on the use of group dynamics to assist and treat individual group members. The specialty is applicable to all age groups, children, adolescents, adults and older adults, for a wide variety of conditions and concerns, and in numerous and diverse settings. NUCC Health Care Provider Taxonomy, code 103TP2701X
All registered taxonomy codes
This provider registers 10 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103TP2701X | Group Psychotherapy Psychologist Group Psychotherapy | PSY19635 | CA | primary |
| 103TC1900X | Counseling Psychologist Counseling | PSY19635 | CA | |
| 103TC1900X | Counseling Psychologist Counseling | 14792 | NY | |
| 103TC0700X | Clinical Psychologist Clinical | 14792 | NY | |
| 103TC0700X | Clinical Psychologist Clinical | PSY19635 | CA | |
| 103TA0400X | Addiction (Substance Use Disorder) Psychologist Addiction (Substance Use Disorder) | 14792 | NY | |
| 103TA0400X | Addiction (Substance Use Disorder) Psychologist Addiction (Substance Use Disorder) | PSY19635 | CA | |
| 103T00000X | Psychologist | 14792 | NY | |
| 103T00000X | Psychologist | PSY19635 | CA | |
| 103TP2701X | Group Psychotherapy Psychologist Group Psychotherapy | 14792 | NY |
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 | 1558400796 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 5, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | PHD |
| Practice address |
8912 VOLUNTEER LN STE 100 Sacramento, CA 95826 (916) 368-3080 |
| Mailing address |
3104 O ST # 336 Sacramento, CA 95816 |
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 | 5 | 5 | 8 | 4 | 0 | 0 | 7 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 1 | 8 | 8 | 0 | 0 | 7 | 9 |
Sum = 64 · next multiple of 10 = 70 · check digit = 6 · actual last digit = 6
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.