Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexander Karl

Psychologist in Wheaton, IL · enumerated 2023.

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

National Provider Identifier

1831875053

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Registry record

Entity type Individual (Type 1)

Name Alexander Karl

Sex Male

Practice address 1737 S Naperville Rd Ste 200, Wheaton, IL, 60189

Phone (630) 653-9700

Enumeration date Jun 22, 2023

Last updated in NPPES Jun 22, 2023

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social 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.

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Frequently asked questions

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.

What specialty is Alexander Karl?

Alexander Karl is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-22.