Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron Mentzer

Physician Assistant in Chicago, IL · enumerated 2024.

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

National Provider Identifier

1437983699

Verified

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Registry record

Entity type Individual (Type 1)

Name Aaron Mentzer

Sex Male

Practice address 1620 W Harrison St, Chicago, IL, 60612

Phone (312) 942-5000

Enumeration date Aug 29, 2024

Last updated in NPPES Aug 29, 2024

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing 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

Where does Aaron Mentzer practice?

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

What is the NPI number for Aaron Mentzer?

The National Provider Identifier (NPI) for Aaron Mentzer is 1437983699, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-29.