Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Ann M. Brennan, NP

Pediatric Nurse Practitioner in Palo Alto, CA · enumerated 2007.

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

National Provider Identifier

1558419200

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Registry record

Entity type Individual (Type 1)

Name Ms. Ann M. Brennan

Credential NP

Sex Female

Practice address 770 Welch Rd, Palo Alto, CA, 94304

Phone (650) 498-2568

Fax (650) 723-4312

Enumeration date Jan 8, 2007

Last updated in NPPES Sep 26, 2014

Taxonomy & licenses

163WW0101X Ambulatory Women's Health Care Registered Nurse Nursing Service Providers · License RN526080 (CA) Secondary

363LX0001X Obstetrics & Gynecology Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License NPF8652 (CA) Secondary

363LA2100X Acute Care Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 3719 (SC) Secondary

363LP0200X Pediatric Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 8652 (CA) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP credential

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 specialty is Ann Brennan?

Ann Brennan is registered in NPPES with the primary taxonomy of Pediatric Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Ali Salim Plastic Surgery Physician · Palo Alto, CA NPI 1194796375 Mary Jane Ajlouny Advanced Practice Midwife · Palo Alto, CA NPI 1629030440 David Cornfield Pediatric Pulmonology Physician · Palo Alto, CA NPI 1598792079 Vincent Hentz Surgery of the Hand (Plastic Surgery) Physician · Palo Alto, CA NPI 1770593501 Palo Alto Endoscopy Center Lp Ambulatory Surgical Clinic/Center · Palo Atlo, CA NPI 1225041502 Jack Koumjian Prosthodontics · Palo Alto, CA NPI 1073629390 Shelley Aggarwal Pediatric Adolescent Medicine Physician · Palo Alto, CA NPI 1013029586 Oscar Ho Plastic Surgery Physician · Palo Alto, CA NPI 1750469896

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-09-26.