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

Mrs. Lissa J Diefendorf, APN

Adult Health Clinical Nurse Specialist in Peoria, IL · enumerated 2011.

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

National Provider Identifier

1427356336

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Registry record

Entity type Individual (Type 1)

Name Mrs. Lissa J Diefendorf

Credential APN

Sex Female

Practice address Peoria, IL, 61604

Phone (309) 222-5736

Enumeration date Mar 2, 2011

Last updated in NPPES Mar 2, 2011

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

Taxonomy & licenses

364SA2200X Adult Health Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License 209008169 (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 Lissa Diefendorf?

The National Provider Identifier (NPI) for Lissa Diefendorf is 1427356336, a Type 1 (individual) record in the CMS NPPES registry.

Where does Lissa Diefendorf practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-02.