Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Nancy L. Mcmahon, ACNP-BC
Nurse Practitioner in Hartford, WI · enumerated 2010.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1861723355
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Registry record
Entity type Individual (Type 1)
Name Nancy L. Mcmahon
Credential ACNP-BC
Sex Female
Practice address 1640 E Sumner St, Hartford, WI, 53027
Phone (262) 670-4000
Enumeration date Jan 22, 2010
Last updated in NPPES Nov 23, 2021
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 3972 (WI) 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
Is NPI 1861723355 active?
Yes, as of the latest NPPES snapshot, NPI 1861723355 is active (record last updated 2021-11-23).
How do I verify Nancy Mcmahon's NPI record?
Cross-check NPI 1861723355 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Christopher Garvey Otolaryngology Physician · Hartford, WI NPI 1780679795 Michael Long Family Medicine Physician · Hartford, WI NPI 1053383646 Aurora Pharmacy, Inc. Community/Retail Pharmacy · Hartford, WI NPI 1538107842 Britta Braden Physician Assistant · Hartford, WI NPI 1083650709 James Bencivenga Occupational Medicine Physician · Hartford, WI NPI 1659304434 Megan Tkachuk Family Medicine Physician · Hartford, WI NPI 1790719086 Aurora Health Care Ventures, Inc. Eyewear Supplier · Hartford, WI NPI 1447270889 Scott Kenitz Optometrist · Hartford, WI NPI 1871516310
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-23.