Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marie Mcmillen, DO

Neurology Physician in Waterloo, IA · enumerated 2015.

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

National Provider Identifier

1255712618

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Registry record

Entity type Individual (Type 1)

Name Marie Mcmillen

Credential DO

Sex Female

Practice address 2710 Saint Francis Dr Ste 201, Waterloo, IA, 50702

Phone (319) 272-5000

Fax (319) 272-6730

Enumeration date Jun 11, 2015

Last updated in NPPES Dec 14, 2020

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 02005698B (IN) Secondary

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License R2489 (AZ) Secondary

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License DO-05614 (IA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

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

What is the NPI number for Marie Mcmillen?

The National Provider Identifier (NPI) for Marie Mcmillen is 1255712618, a Type 1 (individual) record in the CMS NPPES registry.

Where does Marie Mcmillen practice?

The practice location on file with NPPES is in Waterloo, IA. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-14.