By Your Side, LLC
By Your Side, LLC is a healthcare organization registered as Behavior Analyst in Darien, IL, holding Type 2 (organization) NPI 1922233923 since 2009. The authorized official on file is Matthew Sullivan, Chief Financial Officer.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1922233923 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | By Your Side, LLC |
| Other name | <Unavail> |
| Practice address | 8201 CASS AVE, Darien, IL, 60561 |
| Phone | 6305905571 |
| Fax | 6303267175 |
| Enumeration date | 2009-05-19 |
| Last updated in NPPES | 2021-02-04 |
Authorized official
| Name | Matthew Sullivan |
|---|---|
| Title | Chief Financial Officer |
| Phone | 6305905571 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 235Z00000X | Speech-Language Pathologist | Secondary | — | — |
| 103K00000X | Behavior Analyst | Primary | — | — |
Copy-ready billing details
Provider: By Your Side, LLC NPI: 1922233923 Taxonomy: 103K00000X (Behavior Analyst) Address: 8201 CASS AVE, Darien, IL, 60561
Providers at this address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1336066653 | Gianna Senese | Individual | Behavior Technician | Darien, IL |
| 1699692913 | Arielle Lord | Individual | Behavior Technician | Darien, IL |
| 1982521977 | Lillian Konieczny | Individual | Behavior Technician | Darien, IL |
| 1003733999 | Melissa Nunez | Individual | Behavior Technician | Darien, IL |
| 1285551960 | Kyra Cain | Individual | Behavior Technician | Darien, IL |
| 1316224462 | Bys Speech and Occupational Therapy Services, LLC | Organization | Speech-Language Pathologist | Darien, IL |
| 1609311612 | Megan Shelton | Individual | Occupational Therapist | Darien, IL |
| 1962912980 | Ellizabeth Evans | Individual | Behavior Analyst | Darien, IL |
Verify this record
Cross-check NPI 1922233923 against the authoritative CMS record: view By Your Side, LLC 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
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Where is By Your Side, LLC located?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2021-02-04.