Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Abigail Rae Leff, LMSW
Social Worker in Austin, TX · enumerated 2022.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1659091999
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Registry record
Entity type Individual (Type 1)
Name Abigail Rae Leff
Credential LMSW
Sex Female
Practice address 720 Airport Blvd Apt 1344, Austin, TX, 78702
Phone (218) 340-8303
Enumeration date Aug 29, 2022
Last updated in NPPES Aug 29, 2022
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
Where does Abigail Leff practice?
The practice location on file with NPPES is in Austin, TX. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Abigail Leff?
The National Provider Identifier (NPI) for Abigail Leff is 1659091999, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-29.