Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Brittany Mares

Family Nurse Practitioner in Appleton, WI · enumerated 2026 · practices at Fox Valley Pulmonary Medicine, LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1821919580

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Registry record

Entity type Individual (Type 1)

Name Brittany Mares

Sex Female

Practice address 2500 E Capitol Dr Ste 2600, Appleton, WI, 54911

Phone (920) 734-9600

Enumeration date Jul 21, 2026

Last updated in NPPES Jul 21, 2026

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 1875833 (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.

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Frequently asked questions

How do I verify Brittany Mares's NPI record?

Cross-check NPI 1821919580 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821919580 active?

Yes, as of the latest NPPES snapshot, NPI 1821919580 is active (record last updated 2026-07-21).

Other providers at this practice address

Browse all →

Stefanie Thiel Family Nurse Practitioner · Appleton, WI NPI 1659035772 Danielle Ratter Nurse Practitioner · Appleton, WI NPI 1073271961 Fox Valley Pulmonary Medicine, LLC Pulmonary Disease Physician · Appleton, WI NPI 1265590848 Maxwell Machurick Pulmonary Disease Physician · Appleton, WI NPI 1841752680

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-21.