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

Madeleine Bartzak, RN, MPH

Infection Control Registered Nurse in Natick, MA · enumerated 2025.

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

National Provider Identifier

1366303299

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Madeleine Bartzak

Credential RN, MPH

Sex Female

Practice address Natick, MA, 01760

Phone (508) 308-5911

Enumeration date Nov 20, 2025

Last updated in NPPES Nov 20, 2025

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

Taxonomy & licenses

163WI0600X Infection Control Registered Nurse Nursing Service Providers · License 2286223 (MA) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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

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.

What specialty is Madeleine Bartzak?

Madeleine Bartzak is registered in NPPES with the primary taxonomy of Infection Control Registered Nurse. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-20.