By Your Side, LLC
NPI 1922233923 · Behavior Analyst · Darien, IL
By Your Side, LLC is a Behavior Analyst organization in Darien, IL (NPI 1922233923).
Provider details
- NPI number
- 1922233923
- Entity type
- Organization
- Primary specialty
- Behavior AnalystBehavioral Health & Social Service Providers
- Organization subpart
- No
- Authorized official
- Matthew Sullivan, Chief Financial Officer(630) 590-5571
Specialties & taxonomies
Behavioral Health & Social Service Providers
- Speech-Language Pathologist235Z00000X
Speech, Language and Hearing Service Providers
Profile Score
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
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
Mailing address
Other names (DBA / former)
- Doing business as
- By Your Side
- Doing business as
- By Your Side
Registry dates
- Enumerated
- 2009-05-19
- Last updated
- 2021-02-04
- Certified
- 2021-02-04
Frequently asked questions
- What is By Your Side, LLC's NPI number?
- By Your Side, LLC's National Provider Identifier (NPI) is 1922233923, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is By Your Side, LLC?
- By Your Side, LLC is classified in the NPPES registry as Behavior Analyst (Behavioral Health & Social Service Providers).
- Where is By Your Side, LLC located?
- By Your Side, LLC's practice location on file with NPPES is 8201 Cass Ave, Darien, IL 60561-5314.
- What is By Your Side, LLC's phone number?
- The practice phone number listed in the NPPES registry for By Your Side, LLC is (630) 590-5571.
- Who is the authorized official for By Your Side, LLC?
- The authorized official listed on By Your Side, LLC's NPPES record is Matthew Sullivan, Chief Financial Officer. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is By Your Side, LLC's NPI active?
- Yes — By Your Side, LLC's NPI (1922233923) is active in the NPPES registry as of the last update on 2021-02-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.