Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mattie Joy Testroet, ARNP
Nurse Practitioner in Waterloo, IA · enumerated 2015.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1356723399
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Registry record
Entity type Individual (Type 1)
Name Mattie Joy Testroet
Credential ARNP
Sex Female
Practice address 3530 W 4th St, Waterloo, IA, 50701
Phone (319) 233-2701
Fax (319) 236-7993
Enumeration date Jun 26, 2015
Last updated in NPPES May 13, 2025
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License A122571 (IA) 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
Where does Mattie Testroet practice?
The practice location on file with NPPES is in Waterloo, IA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mattie Testroet?
The National Provider Identifier (NPI) for Mattie Testroet is 1356723399, 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 2025-05-13.