Katherine O'Sullivan, LCSW
Katherine O'Sullivan is a Clinical Social Worker provider (Social Worker) practicing in Brewster, NY, registered in the NPPES registry with NPI 1619731908 since 2024. The credential LCSW stands for Licensed Clinical Social Worker.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1619731908 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Katherine O'Sullivan |
| Credential | LCSW |
| Sex | Female |
| Practice address | 21 MARLIN RD, Brewster, NY, 10509 |
| Phone | 6467347891 |
| Enumeration date | 2024-02-07 |
| Last updated in NPPES | 2024-02-07 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 1041C0700X | Clinical Social Worker | Primary | 081032-1 | NY |
LCSW — Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential
Copy-ready billing details
Provider: Katherine O'Sullivan, LCSW NPI: 1619731908 Taxonomy: 1041C0700X (Clinical Social Worker) Address: 21 MARLIN RD, Brewster, NY, 10509
Verify this record
Cross-check NPI 1619731908 against the authoritative CMS record: view Katherine O'Sullivan 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
What specialty is Katherine O'Sullivan?
Is this the official NPI registry?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2024-02-07.