John D. Ayers, MD
Hematology & Oncology Physician · Warrenville, IL
John D. Ayers, MD is a hematology & oncology physician with a practice address in Warrenville, Illinois, and NPI 1477540821, issued on Sep 30, 2005. Check the license (Illinois 036102368, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John D. Ayers
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 036102368 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4405 Weaver Pkwy, Warrenville, IL 60555
- Phone
- (630) 352-5450
- Enumerated
- Sep 30, 2005
- Record last updated
- Jan 22, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (630) 352-5499
- Medicaid ID
- 036102368 IL
- Medicare enrollment
- Enrolled (PECOS I20090717000206); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 666 in Illinois → Look up another NPI →
Also registered at 4405 Weaver Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Abad, M.D.Surgical Oncology Physician1578722336
- Raanan Alter, MDGynecologic Oncology Physician1558789826
- Madeline BiceNurse Practitioner1982189221
- Mackenzie Blackburn, APRN, CNPNurse Practitioner1740005511
- Robin Buerki, MDNeurology Physician1881936326
- Tonia Cabai, NP-CNurse Practitioner1245684018
Verify John D. Ayers 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 036102368Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,007 Medicare Part D claims for 304 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 18 claims were for opioids.
Most prescribed
- Tamoxifen Citrate255 claims
- Letrozole126 claims
- Raloxifene Hcl124 claims
- Anastrozole121 claims
- Eliquis76 claims
- Prochlorperazine Maleate42 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 MIPS final score for 2023 (Medicare payment program): 94.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,742.25
3 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 8,560 providers of this specialty with any payment received $7,481.41 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 2 group practices
- Central Dupage Physician GroupWarrenville, IL
- Northwestern Medical Faculty FoundationWarrenville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John D. Ayers among 666 hematology & oncology physician records in Illinois
John D. Ayers, MD is one of 666 hematology & oncology physician records with a practice address in Illinois. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1995 · median 2003 among the 461 with a school on file
- Record last updated2013 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 hematology & oncology physician records list a practice address in Warrenville
They are 7 of the 517 NPPES records with a practice address in Warrenville, and 666 hematology & oncology physician records in Illinois.
All 666 in Illinois → Every provider in Warrenville → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Renee Cheng, MDWarrenville, IL 605551740784313
- Kevin Dawravoo, M.D.Warrenville, IL 605551912163114
- Fahad Faruqi, MDWarrenville, IL 605551710367008
- Linda Ferris, DOWarrenville, IL 605551902886021
- Laura Horvath, MDWarrenville, IL 605551265522866
- Dragana Tomic, MDWarrenville, IL 605551356523898
- Ramesh Kola, MDSandwich, IL 605481275577512
- Stanley Schade, M.D.Riverside, IL 605461174628093
Common questions
What is John D. Ayers, MD's NPI number?
John D. Ayers, MD's National Provider Identifier (NPI) is 1477540821, issued on Sep 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John D. Ayers, MD located?
The NPPES record lists a practice address at 4405 Weaver Pkwy, Warrenville, IL, 60555. Phone: (630) 352-5450. Providers update this record themselves, so call before visiting.
How can I verify John D. Ayers, MD's license?
NPPES lists Illinois license number 036102368, 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 John D. Ayers, MD prescribe under Medicare Part D?
In 2024, John D. Ayers, MD had 1,007 Medicare Part D claims for 304 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is John D. Ayers, MD's MIPS final score?
The 2023 MIPS final score is 94.1 of 100. 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.