Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Alexandra Miller Dieffenderfer

Physician Assistant in Chapel Hill, NC · enumerated 2017.

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

National Provider Identifier

1689192312

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Registry record

Entity type Individual (Type 1)

Name Mrs. Alexandra Miller Dieffenderfer

Sex Female

Practice address 101 Manning Dr, Chapel Hill, NC, 27514

Phone (984) 974-1000

Enumeration date Sep 1, 2017

Last updated in NPPES May 21, 2019

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 0010-07513 (NC) 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 Alexandra Dieffenderfer?

The National Provider Identifier (NPI) for Alexandra Dieffenderfer is 1689192312, a Type 1 (individual) record in the CMS NPPES registry.

Where does Alexandra Dieffenderfer practice?

The practice location on file with NPPES is in Chapel Hill, NC. 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 2019-05-21.