Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Elizabeth Mattes Nielsen, MD

Pulmonary Disease Physician in Wauwatosa, WI · enumerated 2016 · practices at Visiting Nurse Association of Wisconsin, Inc..

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

National Provider Identifier

1861842007

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Registry record

Entity type Individual (Type 1)

Name Elizabeth Mattes Nielsen

Credential MD

Sex Female

Practice address Wauwatosa, WI, 53213

Phone (414) 615-5900

Enumeration date Jun 19, 2016

Last updated in NPPES Jul 14, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 036147784 (IL) Secondary

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 76831 (WI) Primary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 76831 (WI) Secondary

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 036147784 (IL) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 125.068567 (IL) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 01089069A (IN) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
100243376	Medicaid	WI	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1861842007 active?

Yes, as of the latest NPPES snapshot, NPI 1861842007 is active (record last updated 2026-07-14).

How do I verify Elizabeth Nielsen's NPI record?

Cross-check NPI 1861842007 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-14.