Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jill Tiefen, LCSW

Clinical Social Worker in Wyckoff, NJ · enumerated 2011 · practices at Fitcare Corporation.

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

National Provider Identifier

1669762589

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Registry record

Entity type Individual (Type 1)

Name Jill Tiefen

Credential LCSW

Sex Female

Practice address 291 Franklin Ave, Wyckoff, NJ, 07481

Phone (201) 847-0119

Enumeration date Apr 12, 2011

Last updated in NPPES Jun 8, 2011

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 44SC00764700 (NJ) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

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

Is NPI 1669762589 active?

Yes, as of the latest NPPES snapshot, NPI 1669762589 is active (record last updated 2011-06-08).

How do I verify Jill Tiefen's NPI record?

Cross-check NPI 1669762589 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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Catherine Jobson Physical Therapist · Wyckoff, NJ NPI 1881782944 Fitcare Corporation Clinic/Center · Wyckoff, NJ NPI 1487895843

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-08.