Dr. William Seng Tan, DO
- Medicare services, 2024
- 5,341
- Medicare patients, 2024
- 353
- Part D claims, 2024
- 7,881
- Hospital affiliations
- 5
- Industry payments
- $1,809
- Practice address
- 20060 Governors Dr, Olympia Fields, IL 60461
- Practice phone
- Call (708) 283-8300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Savio Manatt, SC
Olympia Fields, Illinois
Find Dr. Tan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William Seng Tan is a family medicine physician in Olympia Fields, Illinois
Dr. Tan practices at Savio Manatt, SC in Olympia Fields, Illinois.
Dr. Tan's NPI, 1891112306, was assigned on March 21, 2014. Dr. Tan graduated from Nova Southeastern College of Osteo Medicine in 2013. Dr. Tan holds Illinois license 036144064.
- NPI
- 1891112306NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2163717364
- NPI enumeration date
- March 21, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (708) 283-8300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Seng Tan practices at Savio Manatt, SC in Olympia Fields, Illinois
Dr. Tan's primary practice is Savio Manatt, SC, at 20060 Governors Dr, Olympia Fields, IL 60461 in Cook County. The practice phone is (708) 283-8300.
- Savio Manatt, SC20060 Governors Dr, Olympia Fields, IL 60461 · Cook CountyPhone(708) 283-8300
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. William Seng Tan is affiliated with 11 sites of care and 1 medical group
Dr. Tan's primary practice is Savio Manatt, SC in Olympia Fields, Illinois. Dr. Tan is also affiliated with Olympia Fields Hospital. The medical group on file is Savio Manatt M.D. Dmand AI also links Dr. Tan to 4 more hospitals, 3 home health agencies, 1 physician office and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. William Seng Tan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tan practices, 10 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Savio Manatt, SC | Available with a free account |
| +10 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Seng Tan is one of 5,105 family medicine physicians in Illinois
Family medicine is Dr. Tan's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Tan is licensed in Illinois.
Specialties and state licenses
- Family medicine, IllinoisPrimary
Family medicine physicians near Dr. Tan
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William Seng Tan billed Medicare for 5,341 services in 2024
CMS data shows 5,341 Medicare services from Dr. Tan across 17 procedure codes in 2024, for 353 Medicare patients. Medicare paid $88,903 for them. Every service was in an office.
Dr. Tan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 492024: 3,9527965%
- Other services
- 2023: 1342024: 423216%
- Office and hospital visits
- 2023: 2552024: 41262%
- Tests and treatments
- 2023: 1302024: 315142%
- Lab and pathology
- 2023: 1242024: 23993%
Dr. Tan compared with the Illinois median for family medicine physicians, 2024
- Dr. Tan
- Illinois median
- Medicare services
- 5,341vs 35615.0 times
- Medicare patients
- 353vs 1602.2 times
- Part D claims
- 7,181vs 61811.6 times
Medians across 5,015 family medicine physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Tan's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Tan and other family medicine physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Seng Tan treated 353 Medicare patients in 2024, average age 75
CMS counts 353 Medicare patients who saw Dr. Tan in 2024. The largest group is 65 to 74, with 168 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 10% are also on Medicaid. Their average risk score is 1.04, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tan's median patient age at 71, with 55% women.
Dr. Tan's Medicare patients by age, 2024
Dr. Tan's Medicare patients by sex, 2024
- Women18051%
- Men17349%
Chronic conditions among Dr. Tan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes46%
- Arthritis42%
- Chronic kidney disease25%
- Ischemic heart disease19%
- Anxiety18%
- Mood disorders15%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Seng Tan wrote 7,881 Medicare Part D claims in 2024
In 2024, Dr. Tan wrote 7,881 Medicare Part D claims for 725 patients. 89% of them were for generic drugs. CMS names the drug for 7,181 of them, across 131 drugs with 11 or more claims each, at $529,283 in total drug cost. In 2023, CMS named 3,323 claims across 87 drugs.
Dr. Tan's Part D claims by kind of drug, 2024
- Generic7,006 claims89%
- Brand-name817 claims10%
- Other58 claims1%
Dr. Tan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Tan's Part D claims, 2024
- Opioids6%506 of 7,881 claims
- Antibiotics6%490 of 7,881 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,3232024: 7,181116%
Drugs named by CMS: 131 in 2024, 87 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. William Seng Tan takes part in Medicare
Dr. Tan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. William Seng Tan received $1,809 in industry payments from 2016 to 2025
CMS Open Payments shows 38 general payments to Dr. Tan from 14 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 94% of the total. Merck Sharp & Dohme Corporation paid the most, $385.
General payments to Dr. Tan by program year, 2016 to 2025
General payments to Dr. Tan by kind, 2016 to 2025
- Food and beverage$1,70394%
- Gifts$955%
- Education$121%
Companies that paid Dr. Tan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William Seng Tan graduated from Nova Southeastern College of Osteo Medicine
Dr. Tan graduated from Nova Southeastern College of Osteo Medicine in 2013.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Seng Tan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William Seng Tan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William Seng Tan's NPI number?
Dr. William Seng Tan's NPI number is 1891112306. It was assigned on March 21, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. William Seng Tan?
Dr. William Seng Tan is a family medicine physician in Olympia Fields, Illinois. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. William Seng Tan practice?
Dr. Tan practices at 20060 Governors Dr, Olympia Fields, IL 60461. Dr. Tan's primary practice is Savio Manatt, SC in Olympia Fields, Illinois. Dmand AI also links Dr. Tan to 4 hospitals, 3 home health agencies, 1 physician office and 1 group practice or clinic.
What is Dr. William Seng Tan's office phone number?
The practice phone on file for Dr. Tan is (708) 283-8300.
What is Dr. William Seng Tan's medical license number?
Dr. Tan holds Illinois license 036144064.
Which hospitals is Dr. William Seng Tan affiliated with?
Dr. Tan is affiliated with Olympia Fields Hospital. Dmand AI links Dr. Tan to 4 more hospitals.
What medical group is Dr. William Seng Tan part of?
Dr. Tan is linked to Savio Manatt M.D.
Does Dr. William Seng Tan accept Medicare?
Yes. CMS data shows Dr. Tan billed Medicare for 5,341 services in 2024, and Dr. Tan accepts Medicare assignment.
How many Medicare patients does Dr. William Seng Tan see?
CMS counts 353 Medicare patients who saw Dr. Tan in 2024, with an average age of 75.
What services does Dr. William Seng Tan bill to Medicare?
In 2024, Dr. Tan's most billed Medicare services were injected or infused drug (J1010), office visit, established patient (99214) and lab and pathology test (83036).
Show 4 more questionsShow fewer questions
Where did Dr. William Seng Tan go to medical school?
Dr. Tan graduated from Nova Southeastern College of Osteo Medicine in 2013.
What drugs does Dr. William Seng Tan prescribe most?
In 2024 Medicare Part D data, Dr. Tan's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
Has Dr. William Seng Tan received payments from drug or device companies?
CMS Open Payments shows $1,809 in general payments to Dr. Tan from 14 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. William Seng Tan been practicing?
Dr. Tan graduated from medical school in 2013, 13 years ago.
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