NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. David K Tsui, M.S.

Pharmacist in Des Plaines, IL · enumerated 2011.

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

National Provider Identifier

1538441423

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Registry record

Entity type Individual (Type 1)
Name Mr. David K Tsui
Credential M.S.
Sex Male
Practice address Des Plaines, IL, 60018
Phone (847) 299-6611
Enumeration date Sep 15, 2011
Last updated in NPPES Sep 15, 2011

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 051-030120 (IL) 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

Where does David Tsui practice?
The practice location on file with NPPES is in Des Plaines, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for David Tsui?
The National Provider Identifier (NPI) for David Tsui is 1538441423, 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 2011-09-15.