Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Amy Lynn-Engfer Marr

Diagnostic Radiology Physician in Evanston, IL · enumerated 2024.

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

National Provider Identifier

1720831332

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Registry record

Entity type Individual (Type 1)

Name Mrs. Amy Lynn-Engfer Marr

Sex Female

Practice address 2650 Ridge Ave Ste 1304, Evanston, IL, 60201

Phone (847) 570-2700

Fax (847) 570-2822

Enumeration date Apr 11, 2024

Last updated in NPPES Aug 22, 2025

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 2025026423 (MO) 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

What specialty is Amy Marr?

Amy Marr is registered in NPPES with the primary taxonomy of Diagnostic Radiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-22.