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

Dr. Seng M Leong, MD

Internal Medicine Physician in Barrington, IL · enumerated 2006 · practices at Randy Zimmerman M.D.,P.C..

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

National Provider Identifier

1487750790

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Registry record

Entity type Individual (Type 1)

Name Dr. Seng M Leong

Credential MD

Sex Male

Practice address Barrington, IL, 60010

Phone (847) 381-5800

Fax (847) 381-5873

Enumeration date Sep 15, 2006

Last updated in NPPES Mar 31, 2025

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 036-055809 (IL) Primary

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

Other identifiers

Identifier	Type	State	Issuer
L96137	Other	IL	MEDICARE ID
110209671	Other	IL	RAILROAD MEDICARE
CH2241	Other	IL	RAIL ROAD MEDICARE GROUP
03655809	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.

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Frequently asked questions

How do I verify Seng Leong's NPI record?

Cross-check NPI 1487750790 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1487750790 active?

Yes, as of the latest NPPES snapshot, NPI 1487750790 is active (record last updated 2025-03-31).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-31.