DR. WILLIAM SENG TAN D.O.
NPI 1891112306
Family Medicine in Olympia Fields, IL

Q: What is William Tan's NPI number?

The NPI number for William Tan is 1891112306. It was assigned to this individual provider in the NPPES registry on March 21, 2014.

Q: What is William Tan's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for William Tan was last updated on December 25, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.

Active since March 21, 2014PECOS EnrolledAccepts Medicare Assignment

20060 GOVERNORS DR STE 204, OLYMPIA FIELDS, IL 60461(708) 283-8300(708) 283-9245 Get Directions Write a Review

NPPES record last updated: December 25, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 25, 2021, Aug 23, 2017 (2 updates tracked since 2017).

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About Dr. William Seng Tan D.o. NPPES

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

DR. WILLIAM SENG TAN D.O. (NPI 1891112306) is an individual family medicine provider in Olympia Fields, Illinois, licensed in Illinois (036144064) and active in the NPI registry since March 2014. He is enrolled in Medicare PECOS, is affiliated with Advocate Trinity Hospital, and is a graduate of Nova Southeastern College Of Osteo Medicine (2013).

NPPES Registry Identity

NPI1891112306

Entity TypeIndividualMale

Primary Taxonomy207Q00000X

Provider Legal NameDR. WILLIAM SENG TANCredential: D.O.

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

Sole ProprietorNo

Medical School CMSNova Southeastern College Of Osteo MedicineGraduated 2013

Enumeration DateMarch 21, 2014

Last NPPES UpdateDecember 25, 20212 updates tracked since enumeration

NPPES CertifiedDecember 25, 2021

✔ NPI 1891112306 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207Q00000X

License✔ Licensed in IL · 036144064

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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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William Seng Tan D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2163717364

PECOS Enrollment IDI20170919004165

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show William Tan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Savio Manatt, Sc

Same address

Legal Medicine

20060 GOVERNORS DR, SUITE 204
Olympia Fields, IL 60461

Reassigned Medicare billing, Illinois enrollment
2 clinicians in this Medicare group

NPI 1245662394 (708) 283-8300

William Seng Tan, Sc

Same address

Family Medicine

20060 GOVERNORS DR STE 204
Olympia Fields, IL 60461

Reassigned Medicare billing, Illinois enrollment

NPI 1497513840 (708) 283-8300

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

Areas of Expertise CMS Part B claims 14

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

373 services253 patients

Hemoglobin a1c level 83036

Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.

239 services167 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

193 services193 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

130 services130 patients

Influenza vaccine, inactivated 90653

The Influenza vaccine, inactivated, is a shot given to protect against the flu. It contains killed virus particles that help your body build immunity to the flu. It's recommended annually to keep your protection up-to-date. It's safe for ages 6 months and up.

107 services107 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

65 services41 patients

Imaging of retina with remote review by physician 92228

This procedure involves capturing detailed images of your retina, a layer at the back of your eye. These images are then sent to a remote physician for review. It helps diagnose and monitor conditions affecting your eyesight. No discomfort is expected.

56 services55 patients

Pneumococcal vaccine, 23-valent 90732

The 23-valent pneumococcal vaccine is an injection that helps protect against serious infections caused by 23 types of pneumococcal bacteria. It's vital for those at risk, like older adults or people with certain health conditions, to prevent pneumonia, meningitis, and bloodstream infections.

40 services40 patients

Administration of pneumococcal vaccine G0009

The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.

39 services39 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

25 services24 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

22 services22 patients

Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg J3420

This is a procedure where a small dose of Vitamin B-12, also known as Cyanocobalamin, is injected into your body. This vitamin is essential for nerve function and the production of red blood cells. It's often used to treat vitamin B-12 deficiency.

19 services11 patients

Transitional care management services for problem of high complexity 99496

Transitional care management services are designed to ensure a smooth transition from a hospital to home or another care setting for patients with complex health issues. These services include medication management, patient education, and coordination with healthcare providers.

14 services13 patients

Injection, methylprednisolone acetate, 80 mg J1040

Methylprednisolone acetate is a strong anti-inflammatory medication. It is often given as an 80 mg injection to reduce inflammation and pain. It's commonly used for conditions like arthritis, allergic disorders, or other inflammatory diseases.

13 services12 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Advocate Trinity Hospital

Acute Care Hospitals · Chicago, IL

2/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number140048

Location2320 E 93rd StChicago, IL 60617 · Cook County

Emergency services Birthing friendly

Franciscan Health Olympia & Chicago Heights

Acute Care Hospitals · Olympia Fields, IL

2/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number140172

Location20201 S Crawford AvenueOlympia Fields, IL 60461 · Cook County

Emergency services Birthing friendly

Ingalls Memorial Hospital

Acute Care Hospitals · Harvey, IL

2/5 CMS rating

OwnershipPhysician

CMS Certification Number140191

Location1 Ingalls DriveHarvey, IL 60426 · Cook County

Emergency services Birthing friendly

Advocate Christ Hospital & Medical Center

Acute Care Hospitals · Oak Lawn, IL

2/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number140208

Location4440 W 95th StreetOak Lawn, IL 60453 · Cook County

Emergency services Birthing friendly

Franciscan Health Munster

Acute Care Hospitals · Munster, IN

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number150165

Location701 Superior AveMunster, IN 46321 · Lake County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60461 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$94.06 typical visit price

range $60.08 – $183.39

Typical copayment $23.51 (range $15.02 – $45.84)

Most-billed visit code 99203

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

6 suppliers16 claims47 services$5.57 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. SAVIO G MANATT M.D.

Internal Medicine

20060 GOVERNORS DR STE 204
OLYMPIA FIELDS, IL 60461

Cook County (708) 283-8300

WILLIAM SENG TAN, SC

Family Medicine

20060 GOVERNORS DR STE 204
OLYMPIA FIELDS, IL 60461

Cook County (708) 283-8300

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 Tan's NPI number?

The NPI number for William Tan is 1891112306. It was assigned to this individual provider in the NPPES registry on March 21, 2014.

Where is William Tan located?

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

What is William Tan's specialty?

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

Is William Tan enrolled in Medicare?

Yes. William Tan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for William Tan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Tan reassigns Medicare benefits to 2 organizations: Savio Manatt, Sc (Olympia Fields, IL) and William Seng Tan, Sc (Olympia Fields, IL). Each 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 William Tan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is William Tan affiliated with any hospitals?

According to CMS data, William Tan is affiliated with Advocate Trinity Hospital, Franciscan Health Olympia & Chicago Heights, Ingalls Memorial Hospital, Advocate Christ Hospital & Medical Center and Franciscan Health Munster.

When was this NPI record last updated?

The NPPES record for William Tan was last updated on December 25, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.