William James Popovic, MD
Medical Oncology Physician · Shiloh, IL
William James Popovic, MD is a medical oncology physician with a practice address in Shiloh, Illinois, and NPI 1609824549, issued on May 4, 2006. Check the license (Illinois 036060456, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- William James Popovic
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 036060456 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1418 Cross St, Shiloh, IL 62269
- Phone
- (618) 607-1340
- Enumerated
- May 4, 2006
- Record last updated
- Apr 21, 2025
- Fax
- (618) 622-9724
- Medicaid ID
- 200058084 MO
- Medicare enrollment
- Enrolled (PECOS I20101103001175); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 1971
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 182 in Illinois → Look up another NPI →
Also registered at 1418 Cross St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amanda Allen, AGNPGerontology Nurse Practitioner1346999315
- Corey Brooks, PAPhysician Assistant1134466485
- Alfred Greco, MDMedical Oncology Physician1073501607
- Brett Herzog, MD PHDMedical Oncology Physician1023499282
- Paul Kogan, MDUrology Physician1023377736
- Staci Ladowitz, PAMedical Physician Assistant1639711963
Verify William James Popovic in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036060456Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average medical oncology physician in 2024
63 Medicare Part D claims for 11 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims.
Most prescribed
- Hydroxyurea27 claims
- Eliquis17 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 92.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Washington University Physicians IN Illinois IncBelleville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William James Popovic among 182 medical oncology physician records in Illinois
William James Popovic, MD is one of 182 medical oncology physician records with a practice address in Illinois. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 43% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1971 · median 2000 among the 132 with a school on file
- Record last updated2025 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
4 medical oncology physician records list a practice address in Shiloh
They are 4 of the 181 NPPES records with a practice address in Shiloh, and 182 medical oncology physician records in Illinois.
All 182 in Illinois → Every provider in Shiloh → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Justin Floyd, DOO Fallon, IL 622691629164678
- Alfred Greco, MDShiloh, IL 622691073501607
- Brett Herzog, MD PHDShiloh, IL 622691023499282
- John Visconti, DOShiloh, IL 622691033167846
- Mohammed Siddiqui, MDNashville, IL 622631730115973
- Guillermo Rodriguez, MDBelleville, IL 622261861440661
- Philip Dy, M.D.Effingham, IL 624011710076567
- Mario Velasco, MDDecatur, IL 625261326007782
Common questions
What is William James Popovic, MD's NPI number?
William James Popovic, MD's National Provider Identifier (NPI) is 1609824549, issued on May 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William James Popovic, MD located?
The NPPES record lists a practice address at 1418 Cross St, Shiloh, IL, 62269. Phone: (618) 607-1340. Providers update this record themselves, so call before visiting.
How can I verify William James Popovic, MD's license?
NPPES lists Illinois license number 036060456, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William James Popovic, MD prescribe under Medicare Part D?
In 2024, William James Popovic, MD had 63 Medicare Part D claims for 11 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
What is William James Popovic, MD's MIPS final score?
The 2023 MIPS final score is 92.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.