Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Katherine Mastela, LSW

Social Worker in Countryside, IL · enumerated 2017.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1699284984

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Registry record

Entity type Individual (Type 1)

Name Mrs. Katherine Mastela

Credential LSW

Sex Female

Practice address 9649 W 55th St, Countryside, IL, 60525

Phone (708) 352-3580

Enumeration date Sep 29, 2017

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License 150000483 (IL) Primary

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 → Validate an NPI →

Frequently asked questions

What is the NPI number for Katherine Mastela?

The National Provider Identifier (NPI) for Katherine Mastela is 1699284984, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katherine Mastela practice?

The practice location on file with NPPES is in Countryside, IL. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.