Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexander Chan-Han Ou, MD

Neurology Physician in Arlington Heights, IL · enumerated 2015.

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

National Provider Identifier

1649666256

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Registry record

Entity type Individual (Type 1)

Name Alexander Chan-Han Ou

Credential MD

Sex Male

Practice address 880 W Central Rd Ste 7200, Arlington Heights, IL, 60005

Phone (847) 618-4430

Enumeration date Apr 9, 2015

Last updated in NPPES May 29, 2024

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License S8226 (TX) Secondary

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 036170404 (IL) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

How do I verify Alexander Ou's NPI record?

Cross-check NPI 1649666256 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1649666256 active?

Yes, as of the latest NPPES snapshot, NPI 1649666256 is active (record last updated 2024-05-29).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-29.