Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Theresa Mcfadin, FNP-C
Nurse Practitioner in Waterloo, IL · enumerated 2016.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831553908
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Registry record
Entity type Individual (Type 1)
Name Mrs. Theresa Mcfadin
Credential FNP-C
Sex Female
Practice address 6100 Illini Trl, Waterloo, IL, 62298
Phone (618) 616-4782
Enumeration date Apr 5, 2016
Last updated in NPPES Mar 31, 2025
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209013900 (IL) Secondary
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 2015040590 (MO) 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
What specialty is Theresa Mcfadin?
Theresa Mcfadin is registered in NPPES with the primary taxonomy of 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.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-31.