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

Mary Breen

Q: What is the NPI number for Mary Breen?

The National Provider Identifier (NPI) for Mary Breen is 1043784879, a Type 1 (individual) record in the CMS NPPES registry.

Pediatric Clinical Nurse Specialist in Austin, TX · enumerated 2019.

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

National Provider Identifier

1043784879

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Registry record

Entity type Individual (Type 1)

Name Mary Breen

Sex Female

Practice address Austin, TX, 78723

Phone (512) 324-0919

Enumeration date Jan 15, 2019

Last updated in NPPES Jan 15, 2019

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

Taxonomy & licenses

364SP0200X Pediatric Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License 239573 (TX) 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 Mary Breen practice?

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

What is the NPI number for Mary Breen?

The National Provider Identifier (NPI) for Mary Breen is 1043784879, 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 2019-01-15.