Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Abigail Hartwig, LMSW
Social Worker in New York, NY · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720962889
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Registry record
Entity type Individual (Type 1)
Name Abigail Hartwig
Credential LMSW
Sex Female
Practice address 347 W 37th St, New York, NY, 10018
Phone (844) 400-1975
Enumeration date Aug 2, 2025
Last updated in NPPES Aug 2, 2025
Taxonomy & licenses
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.
Frequently asked questions
Is NPI 1720962889 active?
Yes, as of the latest NPPES snapshot, NPI 1720962889 is active (record last updated 2025-08-02).
How do I verify Abigail Hartwig's NPI record?
Cross-check NPI 1720962889 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-02.