Ron S. Gejman, MD, PHD
Medical Oncology Physician · New York, NY
Ron S. Gejman, MD, PHD is a medical oncology physician with a practice address in New York, New York, and NPI 1811523848, issued on Mar 21, 2020. Check the license (New York 323560, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Ron S. Gejman
- Credential
- MD, PHD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 323560 NY
Self-reported in NPPES; status is on the state search - Practice location
- 177 Fort Washington Ave, New York, NY 10032
- Phone
- (212) 305-8923
- Enumerated
- Mar 21, 2020
- Record last updated
- Apr 30, 2026
- Medicare enrollment
- Enrolled (PECOS I20260501003619); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 548 in New York → Look up another NPI →
Also registered at 177 Fort Washington Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Darryl Abrams, MDCritical Care Medicine (Internal Medicine) Physician1881853406
- Benjamin AckermanRegistered Nurse1306695911
- Afua Addo, MSStudent in an Organized Health Care Education/Training Program1225971658
- Shady Ahmed, PT, DPTPhysical Therapist1003208182
- Jane AkomeahFamily Nurse Practitioner1912618430
- Briggitte Alcivar, FNPFamily Nurse Practitioner1003288374
Verify Ron S. Gejman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 323560Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average medical oncology physician in 2024
99 Medicare Part D claims for 33 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D.
Most prescribed
- Anastrozole15 claims
- Omeprazole13 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.
Ron S. Gejman among 548 medical oncology physician records in New York
Ron S. Gejman, MD, PHD is one of 548 medical oncology physician records with a practice address in New York. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 95% of them.
- NPI issued2020 · 95% of these records are older, 4% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2020 · median 2005 among the 389 with a school on file
- Record last updated2026 · 60% 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 New York 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 New York
There are 548 medical oncology physician records in New York.
All 548 in New York → Every provider in New York → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Charles Drake, M.D.New York, NY 100321346297397
- Michael Flamm, M.D.New York, NY 100321477520369
- Stanley Frankel, M.D.New York, NY 100321396785879
- Edward GelmannNew York, NY 100321285632067
- Aiwu He, MD, PHDNew York, NY 100321942306360
- Kevin Kalinsky, M.D.New York, NY 100321669430310
- Nicole Lamanna, MDNew York, NY 100321164493102
- Suzanne Lentzsch, MDNew York, NY 100321104853324
Common questions
What is Ron S. Gejman, MD, PHD's NPI number?
Ron S. Gejman, MD, PHD's National Provider Identifier (NPI) is 1811523848, issued on Mar 21, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Ron S. Gejman, MD, PHD located?
The NPPES record lists a practice address at 177 Fort Washington Ave, New York, NY, 10032. Phone: (212) 305-8923. Providers update this record themselves, so call before visiting.
How can I verify Ron S. Gejman, MD, PHD's license?
NPPES lists New York license number 323560, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ron S. Gejman, MD, PHD prescribe under Medicare Part D?
In 2024, Ron S. Gejman, MD, PHD had 99 Medicare Part D claims for 33 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.