Brian Wilk

Brian Wilk is a Behavior Analyst provider (Behavior Analyst) practicing in Fairfield, CA, registered in the NPPES registry with NPI 1104214923 since 2014. Practices at Mark Choi DDS Inc (listed at the same practice address in NPPES).

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1104214923
Entity type	Individual (Type 1)
Name	Brian Wilk
Sex	Male
Practice address	Fairfield, CA, 94533
Phone	7074222714
Enumeration date	2014-12-31
Last updated in NPPES	2014-12-31

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	1-14-10376	CA

Copy-ready billing details

Provider: Brian Wilk
NPI: 1104214923
Taxonomy: 103K00000X (Behavior Analyst)
Address: Fairfield, CA, 94533

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1821175514	Mark Choi	Individual	Pediatric Dentistry	Fairfield, CA
1184786097	Adrian Flores-Garcia	Individual	Mental Health Counselor	Fairfield, CA
1700904190	Victoria Layne	Individual	Social Worker	Fairfield, CA
1164639688	Joanie Fellows	Individual	Marriage & Family Therapist	Fairfield, CA
1598954612	Tiffany Hope Scott	Individual	Marriage & Family Therapist	Fairfield, CA
1144498189	Heather Duncan	Individual	Marriage & Family Therapist	Fairfield, CA
1457592958	Mark Choi DDS Inc	Organization	Dental Clinic/Center	Fairfield, CA

Verify this record

Cross-check NPI 1104214923 against the authoritative CMS record: view Brian Wilk 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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Brian Wilk?

Brian Wilk is registered in NPPES with the primary taxonomy of Behavior Analyst. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2014-12-31.