IndividualActive
Marissa Williams
NPI 1235776139 · Assistant Behavior Analyst · Irvine, CA
Marissa Williams is a Assistant Behavior Analyst provider in Irvine, CA (NPI 1235776139).
Provider details
- NPI number
- 1235776139
- Entity type
- Individual
- Primary specialty
- Assistant Behavior AnalystBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Established profile(58/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
3652 Michelson Dr
Irvine, CA 92612-1727
Phone: (949) 738-0154
Street-level locationGet directions
Mailing address
417 E Tamarack Ave Unit 48
Inglewood, CA 90301-6325
Registry dates
- Enumerated
- 2019-12-10
- Last updated
- 2024-09-26
- Certified
- 2024-09-26
Frequently asked questions
- What is Marissa Williams's NPI number?
- Marissa Williams's National Provider Identifier (NPI) is 1235776139, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Williams's specialty?
- Marissa Williams is listed in the NPPES registry with a primary specialty of Assistant Behavior Analyst (Behavioral Health & Social Service Providers).
- Where is Marissa Williams located?
- Marissa Williams's practice location on file with NPPES is 3652 Michelson Dr, Irvine, CA 92612-1727.
- What is Marissa Williams's phone number?
- The practice phone number listed in the NPPES registry for Marissa Williams is (949) 738-0154.
- Is Marissa Williams's NPI active?
- Yes — Marissa Williams's NPI (1235776139) is active in the NPPES registry as of the last update on 2024-09-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.