Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Mary Jean Gustafson, RN C

Registered Nurse in Evanston, IL · enumerated 2007 · practices at Olga Mest Interpreters Inc.

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

National Provider Identifier

1851594709

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mrs. Mary Jean Gustafson

Credential RN C

Sex Female

Practice address 2123 Wesley Ave, Evanston, IL, 60201

Phone (773) 593-7379

Fax (847) 328-7494

Enumeration date Jun 7, 2007

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

133N00000X Nutritionist Dietary & Nutritional Service Providers Secondary

163W00000X Registered Nurse Nursing Service Providers 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1851594709 active?

Yes, as of the latest NPPES snapshot, NPI 1851594709 is active (record last updated 2025-09-11).

How do I verify Mary Gustafson's NPI record?

Cross-check NPI 1851594709 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 →

Olga Mest Interpreters Inc Nutritionist · Evanston, IL NPI 1760502959

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.