Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Lydia Alter
Social Worker in Chicago, IL · enumerated 2021.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598332777
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Registry record
Entity type Individual (Type 1)
Name Lydia Alter
Sex Female
Practice address 2923 N Milwaukee Ave, Chicago, IL, 60618
Phone (312) 298-9027
Enumeration date Jun 7, 2021
Last updated in NPPES Jun 7, 2021
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 Lydia Alter practice?
The practice location on file with NPPES is in Chicago, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Lydia Alter?
The National Provider Identifier (NPI) for Lydia Alter is 1598332777, a Type 1 (individual) record in the CMS NPPES registry.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-07.