Mary J. Fidler, M.D.
Medical Oncology Physician · Chicago, IL
Mary J. Fidler, M.D. is a medical oncology physician with a practice address in Chicago, Illinois, and NPI 1598960494, issued on Jun 19, 2007. Check the license (Illinois 036-110775, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mary J. Fidler
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 036-110775 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1725 W Harrison St, Chicago, IL 60612
- Phone
- (312) 942-5904
- Enumerated
- Jun 19, 2007
- Record last updated
- Apr 14, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20051020000377); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 182 in Illinois → Look up another NPI →
Also registered at 1725 W Harrison St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Qurrat-Ul-Ain Abid, MDHospice and Palliative Medicine (Internal Medicine) Physician1053949024
- John Acheson, MDSurgery Physician1205528726
- David Agbunag, PA-CSurgical Physician Assistant1093885188
- Eda Akyar, MDSports Medicine (Family Medicine) Physician1255910006
- Jorelle Alexander, DMD,MPHDentist1972790756
- Amjad Ali, M.D.Specialist1952359184
Verify Mary J. Fidler 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 036-110775Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% more Medicare Part D claims than the average medical oncology physician in 2024
822 Medicare Part D claims for 155 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 39% of claims. 45 claims were for opioids.
Most prescribed
- Tagrisso89 claims
- Levothyroxine Sodium72 claims
- Dexamethasone47 claims
- Ondansetron Hcl32 claims
- Prednisone25 claims
- Prochlorperazine Maleate25 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.
Industry payments in 2024: $65,528.60
61 payments; by number, the most common kind was food and beverage; the largest payer was Novocure Inc. The 3,343 providers of this specialty with any payment received $11,773.47 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Rush University Medical GroupChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary J. Fidler among 182 medical oncology physician records in Illinois
Mary J. Fidler, M.D. 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 2007, is newer than 57% of them.
- NPI issued2007 · 57% of these records are older, 37% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated2001 · median 2000 among the 132 with a school on file
- Record last updated2011 · 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).
Medical Oncology Physician providers in Illinois
There are 182 medical oncology physician records in Illinois.
All 182 in Illinois → Every provider in Chicago → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Marta Batus, MDChicago, IL 606121003087768
- Philip Bonomi, M.D.Chicago, IL 606121235198573
- Melody Cobleigh, M.D.Chicago, IL 606121861451122
- Kevin Conlon, M.D.Chicago, IL 606121013977370
- Katherine Kabaker, M.D.Chicago, IL 606121699951137
- Thomas Lad, M.D.Chicago, IL 606121972511632
- Sarah Lincoln, M.D.Chicago, IL 606121841250552
- Susan McDunn, MDChicago, IL 606121821002098
Common questions
What is Mary J. Fidler, M.D.'s NPI number?
Mary J. Fidler, M.D.'s National Provider Identifier (NPI) is 1598960494, issued on Jun 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mary J. Fidler, M.D. located?
The NPPES record lists a practice address at 1725 W Harrison St, Chicago, IL, 60612. Phone: (312) 942-5904. Providers update this record themselves, so call before visiting.
How can I verify Mary J. Fidler, M.D.'s license?
NPPES lists Illinois license number 036-110775, 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 Mary J. Fidler, M.D. prescribe under Medicare Part D?
In 2024, Mary J. Fidler, M.D. had 822 Medicare Part D claims for 155 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
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.