Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Cathy A Armstrong, RN
Registered Nurse in Plummer, ID · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1255312112
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Registry record
Entity type Individual (Type 1)
Name Ms. Cathy A Armstrong
Credential RN
Sex Female
Practice address 1100 A St, Plummer, ID, 83851
Phone (208) 686-1767
Enumeration date Nov 8, 2005
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam.
About the RN 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.
Frequently asked questions
How do I verify Cathy Armstrong's NPI record?
Cross-check NPI 1255312112 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1255312112 active?
Yes, as of the latest NPPES snapshot, NPI 1255312112 is active (record last updated 2007-07-08).
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.