Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joseph W. Aschenbrenner, O.D.

Optometrist in Barrington, IL · enumerated 2007.

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

National Provider Identifier

1841329786

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Registry record

Entity type Individual (Type 1)

Name Dr. Joseph W. Aschenbrenner

Credential O.D.

Sex Male

Practice address 330 E Main St, Suite 1 East, Barrington, IL, 60010

Phone (847) 381-5313

Enumeration date Mar 5, 2007

Last updated in NPPES Oct 29, 2009

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 046.007840 (IL) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD 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

What is the NPI number for Joseph Aschenbrenner?

The National Provider Identifier (NPI) for Joseph Aschenbrenner is 1841329786, a Type 1 (individual) record in the CMS NPPES registry.

Where does Joseph Aschenbrenner practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-29.