Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Alex R Tan, OD
Optometrist in Oak Park, IL · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1215921655
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Registry record
Entity type Individual (Type 1)
Name Alex R Tan
Credential OD
Sex Male
Practice address 603 Madison St, Oak Park, IL, 60302
Phone (708) 383-2150
Enumeration date Aug 31, 2005
Last updated in NPPES Feb 6, 2013
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 046009172 | Medicaid | IL | - |
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.
Frequently asked questions
Is NPI 1215921655 active?
Yes, as of the latest NPPES snapshot, NPI 1215921655 is active (record last updated 2013-02-06).
How do I verify Alex Tan's NPI record?
Cross-check NPI 1215921655 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-02-06.