Gregory P. Warren, MD
Hematology & Oncology Physician · Cleveland, OH
Gregory P. Warren, MD is a hematology & oncology physician with a practice address in Cleveland, Ohio, and NPI 1154309243, issued on Jan 9, 2006. Check the license (Ohio 35-06-8930W, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Gregory P. Warren
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 35-06-8930W OH
Self-reported in NPPES; status is on the state search - Practice location
- 18697 Bagley RD, Cleveland, OH 44130
- Phone
- (440) 816-6051
- Enumerated
- Jan 9, 2006
- Record last updated
- Jan 19, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 0170176 OH
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 513 in Ohio → Look up another NPI →
Also registered at 18697 Bagley RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Conor Bennett, DOAnesthesiology Physician1851978381
- Victor Ceicys, M.D.Diagnostic Radiology Physician1154316149
- Rebecca Cirino, D.O.Psychiatry Physician1184690323
- Patrick Cleary, PA-CPhysician Assistant1023095635
- Jacquelyn D'Amico, PA-CPhysician Assistant1073064374
- Rebecca DeweesePsychiatric/Mental Health Nurse Practitioner1831649904
Verify Gregory P. Warren in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35-06-8930WCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
54 Medicare Part D claims for 18 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Letrozole14 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): 77.3 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).
Gregory P. Warren among 513 hematology & oncology physician records in Ohio
Gregory P. Warren, MD is one of 513 hematology & oncology physician records with a practice address in Ohio. 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 16% of them.
- NPI issued2006 · 16% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2021 · 53% 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 Ohio 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 Ohio
There are 513 hematology & oncology physician records in Ohio.
All 513 in Ohio → Every provider in Cleveland → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Housam Haddad, MDIndependence, OH 441311497042832
- Mark Kyei, M.D.Independence, OH 441311982799185
- Elliott Dickman, MDMayfield Hts, OH 441241073681177
- James SchusterStrongsville, OH 441361730611682
- Elnora Spradling, MDStrongsville, OH 441361194040493
- Jason Stern, DOMayfield Hts, OH 441241215005319
- Jason Valent, M.D.Strongsville, OH 441361013936871
- Bennett Yu, M.D.Strongsville, OH 441361609922343
Common questions
What is Gregory P. Warren, MD's NPI number?
Gregory P. Warren, MD's National Provider Identifier (NPI) is 1154309243, issued on Jan 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory P. Warren, MD located?
The NPPES record lists a practice address at 18697 Bagley RD, Cleveland, OH, 44130. Phone: (440) 816-6051. Providers update this record themselves, so call before visiting.
How can I verify Gregory P. Warren, MD's license?
NPPES lists Ohio license number 35-06-8930W, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory P. Warren, MD prescribe under Medicare Part D?
In 2024, Gregory P. Warren, MD had 54 Medicare Part D claims for 18 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Gregory P. Warren, MD's MIPS final score?
The 2023 MIPS final score is 77.3 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.