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WILLIAM SENG TAN, SC
NPI 1497513840
Family Medicine in Olympia Fields, IL

Active since March 11, 2024CLIA 14D2308022 · Waiver
20060 GOVERNORS DR STE 204, OLYMPIA FIELDS, IL 60461(708) 283-8300(708) 283-9245 Get Directions Write a Review

NPPES record last updated: March 11, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About William Seng Tan, Sc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM SENG TAN, SC (NPI 1497513840) is a healthcare organization registered as a family medicine in Olympia Fields, Illinois and active in the NPI registry since March 2024. The organization holds a CLIA Waiver certificate valid through July 18, 2028 and lists William S Tan, President, as its authorized official.

NPPES Registry Identity

NPI1497513840
Entity TypeOrganization
Primary Taxonomy207Q00000X
Legal Business NameWILLIAM SENG TAN, SC
Location Address20060 GOVERNORS DR STE 204Olympia Fields, IL 60461-1099
Mailing Address20060 Governors Dr Ste 204Olympia Fields, IL 60461-1099 · (708) 283-8300 · Fax (708) 283-9245
Phone(708) 283-8300
Fax(708) 283-9245
Organization SubpartNo
Authorized OfficialWilliam S TanPresident · (708) 283-8300
Enumeration DateMarch 11, 2024
NPPES CertifiedMarch 11, 2024
✔ NPI 1497513840 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
20060 GOVERNORS DR STE 204, Olympia Fields, IL 60461
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Seng Tan, Sc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to William Seng Tan, Sc, which bills Medicare for the services this clinician delivers.

Clinician (1)

William Tan, D.O.
Family Practice
NPI 1891112306
20060 GOVERNORS DR STE 204
Olympia Fields, IL 60461
(708) 283-8300
✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 14D2308022

William Seng Tan S C · Olympia Fields, IL
Active · expires Jul 18, 2028
CLIA Number14D2308022
Laboratory TypePhysician Office
Certificate Effective DateJuly 19, 2026
Certificate Expiration DateJuly 18, 2028
Laboratory DirectorWilliam Seng Tan
Laboratory Phone(708) 283-8300
Laboratory LocationWilliam Seng Tan S C20060 Governors Dr - Ste 204, Olympia Fields, IL 60461
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory to perform only waived tests.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Seng Tan, Sc's NPI number?

The NPI number for William Seng Tan, Sc is 1497513840. It was assigned to this organization in the NPPES registry on March 11, 2024.

Where is William Seng Tan, Sc located?

William Seng Tan, Sc is located at 20060 Governors Dr Ste 204, Olympia Fields, IL 60461. The listed phone number is (708) 283-8300.

What is William Seng Tan, Sc's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is William Seng Tan, Sc enrolled in Medicare?

Yes. William Seng Tan, Sc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through William Seng Tan, Sc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Family Practice) reassigns their Medicare billing to William Seng Tan, Sc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does William Seng Tan, Sc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 14D2308022) is associated with this NPI, valid through July 18, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for William Seng Tan, Sc was last updated on March 11, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.