Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Allison Armstrong
Nurse Practitioner in Palo Alto, CA · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598261166
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Registry record
Entity type Individual (Type 1)
Name Allison Armstrong
Sex Female
Practice address 725 Welch Rd, Palo Alto, CA, 94304
Phone (650) 497-8000
Enumeration date Apr 3, 2018
Last updated in NPPES Mar 13, 2023
Taxonomy & licenses
363LP0200X Pediatric Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95008272 (CA) Secondary
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95008272 (CA) 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.
Frequently asked questions
How do I verify Allison Armstrong's NPI record?
Cross-check NPI 1598261166 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1598261166 active?
Yes, as of the latest NPPES snapshot, NPI 1598261166 is active (record last updated 2023-03-13).
Other providers at this practice address
Browse all → Fred Laningham Pediatric Radiology Physician · Palo Alto, CA NPI 1962405753 David Ansel Developmental - Behavioral Pediatrics Physician · Palo Alto, CA NPI 1376547612 Allen Eskenazi Pediatrics Physician · Palo Alto, CA NPI 1487658332 Mohamed Hasan Neonatal-Perinatal Medicine Physician · Palo Alto, CA NPI 1538164470 Erin Holsinger Pediatrics Physician · Palo Alto, CA NPI 1003817347 Francisco Alvarez Hospitalist Physician · Palo Alto, CA NPI 1174525612 Katayoon Shahinfar Pediatrics Physician · Palo Alto, CA NPI 1700874559 Veronica Rooks Pediatric Radiology Physician · Palo Alto, CA NPI 1457341935
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-13.