Gregory James Gerstner, M.D.
Hematology & Oncology Physician · Peoria, IL
Gregory James Gerstner, M.D. is a hematology & oncology physician with a practice address in Peoria, Illinois, and NPI 1629288659, issued on May 22, 2007. Check the license (Illinois 036.120707, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Gregory James Gerstner
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- 036.120707 IL
PG PERMIT# 80968 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 8940 N Wood Sage RD, Peoria, IL 61615
- Phone
- (309) 243-3000
- Enumerated
- May 22, 2007
- Record last updated
- Mar 2, 2026
- Fax
- (309) 243-3069
- Medicare enrollment
- Enrolled (PECOS I20080710000057); accepts Medicare assignment
- Medical or professional school
- Southern Illinois University School Of Medicine, 2002
- 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 8940 N Wood Sage RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mohammad Asad, MDHematology & Oncology Physician1982910527
- Madhuri Bajaj, MDHematology & Oncology Physician1699883595
- Mari Baker, M.D.Emergency Medicine Physician1962431585
- Caroline Barnes, APPNurse Practitioner1518216779
- Debra Beach, APNClinical Nurse Specialist1013945849
- Elizabeth Berryman, APPNurse Practitioner1750843199
Verify Gregory James Gerstner 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 036.120707Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.0 times the Medicare Part D claims of the average hematology & oncology physician in 2024
3,541 Medicare Part D claims for 432 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. 113 claims were for opioids.
Most prescribed
- Acyclovir226 claims
- Levothyroxine Sodium211 claims
- Dexamethasone208 claims
- Prochlorperazine Maleate146 claims
- Hydroxyurea139 claims
- Prednisone132 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): 72.9 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
- Oncology-Hematology Associates OF Central Illinois P CWashington, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory James Gerstner among 666 hematology & oncology physician records in Illinois
Gregory James Gerstner, M.D. 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 2007, is newer than 43% of them.
- NPI issued2007 · 43% of these records are older, 48% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2002 · median 2003 among the 461 with a school on file
- Record last updated2026 · 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).
Hematology & Oncology Physician providers in Illinois
There are 666 hematology & oncology physician records in Illinois.
All 666 in Illinois → Every provider in Peoria → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Stephen Cullinan, MDPeoria, IL 616151962402529
- Paul Fishkin, MDPeoria, IL 616151063411379
- Francois Geoffroy, MDPeoria, IL 616151871593434
- James Gerstner, MDPeoria, IL 616151285633503
- Srinivas Jujjavarapu, MDPeoria, IL 616151336148659
- James Knost, MDPeoria, IL 616151245239565
- John Kugler, MDPeoria, IL 616151083613947
- Pankaj Kumar, M.D.Peoria, IL 616151073576922
Common questions
What is Gregory James Gerstner, M.D.'s NPI number?
Gregory James Gerstner, M.D.'s National Provider Identifier (NPI) is 1629288659, issued on May 22, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory James Gerstner, M.D. located?
The NPPES record lists a practice address at 8940 N Wood Sage RD, Peoria, IL, 61615. Phone: (309) 243-3000. Providers update this record themselves, so call before visiting.
How can I verify Gregory James Gerstner, M.D.'s license?
NPPES lists Illinois license number 036.120707, 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 Gregory James Gerstner, M.D. prescribe under Medicare Part D?
In 2024, Gregory James Gerstner, M.D. had 3,541 Medicare Part D claims for 432 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Gregory James Gerstner, M.D.'s MIPS final score?
The 2023 MIPS final score is 72.9 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.