IndividualActive
William Arnold
NPI 1366687543 · Behavior Analyst · Joliet, IL
William Arnold is a Behavior Analyst provider in Joliet, IL (NPI 1366687543).
Provider details
- NPI number
- 1366687543
- Entity type
- Individual
- Primary specialty
- Behavior AnalystBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(80/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 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
777 Joyce Rd
Joliet, IL 60436-1876
Phone: (815) 727-6666
Fax: (815) 723-1177
Street-level locationGet directions
Mailing address
446 S Grand Ave
Bourbonnais, IL 60914-2238
Registry dates
- Enumerated
- 2008-12-02
- Last updated
- 2008-12-02
Frequently asked questions
- What is William Arnold's NPI number?
- William Arnold's National Provider Identifier (NPI) is 1366687543, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Arnold's specialty?
- William Arnold is listed in the NPPES registry with a primary specialty of Behavior Analyst (Behavioral Health & Social Service Providers).
- Where is William Arnold located?
- William Arnold's practice location on file with NPPES is 777 Joyce Rd, Joliet, IL 60436-1876.
- What is William Arnold's phone number?
- The practice phone number listed in the NPPES registry for William Arnold is (815) 727-6666.
- Is William Arnold's NPI active?
- Yes — William Arnold's NPI (1366687543) is active in the NPPES registry as of the last update on 2008-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.