Marissa L. Williamson, BCBA
Marissa L. Williamson is a Behavior Analyst provider (Behavior Analyst) practicing in Thousand Oaks, CA, registered in the NPPES registry with NPI 1942512496 since 2010.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1942512496 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Marissa L. Williamson |
| Credential | BCBA |
| Sex | Female |
| Practice address | Thousand Oaks, CA, 91360 |
| Phone | 8772629133 |
| Fax | 8772629134 |
| Enumeration date | 2010-07-12 |
| Last updated in NPPES | 2010-07-12 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 103K00000X | Behavior Analyst | Primary | 1-09-6790 | — |
Copy-ready billing details
Provider: Marissa Williamson, BCBA NPI: 1942512496 Taxonomy: 103K00000X (Behavior Analyst) Address: Thousand Oaks, CA, 91360
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1407867757 | Lisa White | Individual | Marriage & Family Therapist | Thousand Oaks, CA |
| 1548323850 | Shirley Glynn | Individual | Clinical Psychologist | Thousand Oaks, CA |
| 1629103254 | Mindy Gillihan | Individual | Marriage & Family Therapist | Thousand Oaks, CA |
| 1124158035 | Aileen Nealie | Individual | Marriage & Family Therapist | Thousand Oaks, CA |
| 1437270964 | Barbara Porush | Individual | Marriage & Family Therapist | Thousand Oaks, CA |
| 1003123845 | David Scrivner | Individual | Marriage & Family Therapist | Thousand Oaks, CA |
| 1629370630 | Shannon Duncan | Individual | Behavior Analyst | Thousand Oaks, CA |
| 1215239074 | Laura Dodds | Individual | Behavior Analyst | Thousand Oaks, CA |
Verify this record
Cross-check NPI 1942512496 against the authoritative CMS record: view Marissa L. Williamson on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2010-07-12.