Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Katherine Lynn Erstad, NP
Nurse Practitioner in Appleton, WI · enumerated 2011.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1497033609
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Registry record
Entity type Individual (Type 1)
Name Mrs. Katherine Lynn Erstad
Credential NP
Sex Female
Practice address 145 W Calumet St, Appleton, WI, 54915
Phone (920) 967-4141
Fax (833) 972-1585
Enumeration date Jul 22, 2011
Last updated in NPPES Nov 13, 2024
Taxonomy & licenses
363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License TEMP (TX) Secondary
363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 4894 (WI) Secondary
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 4894-33 (WI) 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.
Frequently asked questions
Where does Katherine Erstad practice?
The practice location on file with NPPES is in Appleton, WI. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Katherine Erstad?
The National Provider Identifier (NPI) for Katherine Erstad is 1497033609, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-11-13.