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Mark Willer, BCBA
NPI 1609123835 · Behavior Analyst · Fairfax, VA
Mark Willer, BCBA is a Behavior Analyst provider in Fairfax, VA (NPI 1609123835).
Provider details
- NPI number
- 1609123835
- Entity type
- Individual
- Primary specialty
- Behavior AnalystBehavioral Health & Social Service Providers
- Credential
- BCBA
- Sex
- Male
- Sole proprietor
- Yes
- License
- 1-12-11579 (VA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(79/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
13 yrs in NPPES registry
- Profile completeness38% of score
100% 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
4102 Middle Ridge Dr
Fairfax, VA 22033-3226
Phone: (703) 507-9992
Street-level locationGet directions
Mailing address
4102 Middle Ridge Dr
Fairfax, VA 22033
Registry dates
- Enumerated
- 2012-08-07
- Last updated
- 2012-08-07
Frequently asked questions
- What is Mark Willer's NPI number?
- Mark Willer's National Provider Identifier (NPI) is 1609123835, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Willer's specialty?
- Mark Willer is listed in the NPPES registry with a primary specialty of Behavior Analyst (Behavioral Health & Social Service Providers).
- Where is Mark Willer located?
- Mark Willer's practice location on file with NPPES is 4102 Middle Ridge Dr, Fairfax, VA 22033-3226.
- What is Mark Willer's phone number?
- The practice phone number listed in the NPPES registry for Mark Willer is (703) 507-9992.
- Is Mark Willer's NPI active?
- Yes — Mark Willer's NPI (1609123835) is active in the NPPES registry as of the last update on 2012-08-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.