Gregory Cason, PH.D.
Gregory Cason, PH.D. is a Health Psychologist in Los Angeles, CA, registered under NPI 1619180049. This provider registers 4 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 566 S SAN VICENTE BLVD STE 201, Los Angeles, CA 90048. 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 |
|---|---|---|
| PSY15781 | CA | Health Psychologist primary |
| PSY15781 | CA | Cognitive & Behavioral Psychologist |
| PSY15781 | CA | Clinical Psychologist |
| PSY15781 | CA | Counseling Psychologist |
This provider holds licence PSY15781 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 Health covers
A psychologist who specializes in clinical health psychology that investigates and implements clinical services across diverse populations and settings to promote health and well-being and to prevent, treat, and manage illness and disability. Clinical health psychology sees health as the confluence of psychological, social, cultural, and biological factors and applies this understanding to professional activities including:<br/>* Research<br/>* Clinical service<br/>* Consulting with, educating, and supervising other health care providers and psychologists<br/>* Advising organizations, institutions, the public, and policymakers NUCC Health Care Provider Taxonomy, code 103TH0004X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103TH0004X | Health Psychologist Health | PSY15781 | CA | primary |
| 103TB0200X | Cognitive & Behavioral Psychologist Cognitive & Behavioral | PSY15781 | CA | |
| 103TC0700X | Clinical Psychologist Clinical | PSY15781 | CA | |
| 103TC1900X | Counseling Psychologist Counseling | PSY15781 | 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 | 1619180049 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 8, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | PH.D. |
| Practice address |
566 S SAN VICENTE BLVD STE 201 Los Angeles, CA 90048 (310) 652-0031 Fax (425) 944-0918 |
| Mailing address |
8581 SANTA MONICA BLVD # 221 West Hollywood, CA 90069 |
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 | 6 | 1 | 9 | 1 | 8 | 0 | 0 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 2 | 9 | 2 | 8 | 0 | 0 | 8 |
Sum = 61 · next multiple of 10 = 70 · check digit = 9 · actual last digit = 9
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.