Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cynthia A Diefenbeck, CNS

Psychiatric/Mental Health Clinical Nurse Specialist in Newark, DE · enumerated 2007.

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

National Provider Identifier

1578750915

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Registry record

Entity type Individual (Type 1)

Name Cynthia A Diefenbeck

Credential CNS

Sex Female

Practice address 910 S Chapel St, # 102, Newark, DE, 19713

Phone (302) 224-1400

Fax (302) 224-1402

Enumeration date Oct 1, 2007

Last updated in NPPES Nov 15, 2011

Taxonomy & licenses

364S00000X Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License LE-0000143 (DE) Secondary

364SP0808X Psychiatric/Mental Health Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License LE-0000143 (DE) Primary

Other identifiers

Identifier	Type	State	Issuer
LE-0000143	Other	DE	DE MEDICAL LICENSE NUMBER

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.

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Frequently asked questions

Where does Cynthia Diefenbeck practice?

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

What is the NPI number for Cynthia Diefenbeck?

The National Provider Identifier (NPI) for Cynthia Diefenbeck is 1578750915, 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 2011-11-15.