Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Rachael Demattei, APRN

Nurse Practitioner in O Fallon, IL · enumerated 2022.

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

National Provider Identifier

1891443289

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Rachael Demattei

Credential APRN

Sex Female

Practice address 321 Regency Park Ste 100, O Fallon, IL, 62269

Phone (618) 416-7970

Fax (618) 416-7971

Enumeration date Mar 15, 2022

Last updated in NPPES Oct 17, 2023

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 041495134 (IL) Secondary

163W00000X Registered Nurse Nursing Service Providers · License 2017003138 (MO) Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209027937 (IL) Primary

APRN · Advanced Practice Registered Nurse: An umbrella credential covering NPs, CRNAs, CNMs, and clinical nurse specialists. About the APRN 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 NPI 1891443289 active?

Yes, as of the latest NPPES snapshot, NPI 1891443289 is active (record last updated 2023-10-17).

How do I verify Rachael Demattei's NPI record?

Cross-check NPI 1891443289 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 →

Bassam Maalouf Hematology & Oncology Physician · O Fallon, IL NPI 1720173438 Justin Floyd Medical Oncology Physician · O Fallon, IL NPI 1629164678 Mark Walshauser Hematology & Oncology Physician · O Fallon, IL NPI 1306020664 Bachir Farah Hematology & Oncology Physician · O Fallon, IL NPI 1336370915 Laurean Winston Physician Assistant · O Fallon, IL NPI 1790111490 Jacob Witt Radiation Oncology Physician · O Fallon, IL NPI 1891157871 Ryan Mueller Radiation Oncology Physician · O Fallon, IL NPI 1912571654 Julianne Tomac Family Nurse Practitioner · O Fallon, IL NPI 1245018944

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-17.