Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Ms. Karen C Dilfer, OTR

Q: What is the NPI number for Karen Dilfer?

The National Provider Identifier (NPI) for Karen Dilfer is 1558504621, a Type 1 (individual) record in the CMS NPPES registry.

Occupational Therapist in Niles, IL · enumerated 2009.

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

National Provider Identifier

1558504621

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Registry record

Entity type Individual (Type 1)

Name Ms. Karen C Dilfer

Credential OTR

Sex Female

Practice address Niles, IL, 60714

Phone (847) 293-9559

Enumeration date Apr 19, 2009

Last updated in NPPES Nov 22, 2024

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

225X00000X Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 056.008287 (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

Where does Karen Dilfer practice?

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

What is the NPI number for Karen Dilfer?

The National Provider Identifier (NPI) for Karen Dilfer is 1558504621, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-11-22.