Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor
Mrs. Meryl Susan Leff, LCSW, CASAC, BCD
Addiction (Substance Use Disorder) Counselor in Babylon, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1689767592
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Registry record
Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 2649282 | Other | NY | AETNA PROVIDER ID |
| 87726 | Other | NY | UN. BEH. HEALTH PROV ID |
| 131751 | Other | NY | VYTRA PROVIDER ID |
| 161543 MHS | Other | NY | VALUE OPTIONS PROVIDER ID |
| 7480430 | Other | NY | GHI PROVIDER ID |
| NX4021 | Other | NY | BLUE CROSS PROVIDER ID |
| 02116558 | Medicaid | NY | - |
| 1435082 | Other | NY | CIGNA PROVIDER ID |
| P2559539 | Other | NY | OXFORD PROVIDER ID |
| 303899 | Other | - | MHN |
| 42259P | Other | NY | HIP PROVIDER ID |
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.
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Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.