Leonard Kessler, MD
Hematology & Oncology Physician · Rockville Centre, NY
Leonard Kessler, MD is a hematology & oncology physician with a practice address in Rockville Centre, New York, and NPI 1942209135, issued on Jul 19, 2005. Check the license (New York 127415, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Leonard Kessler
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 127415 NY
Self-reported in NPPES; status is on the state search - Practice location
- 242 Merrick RD, Rockville Centre, NY 11570
- Phone
- (516) 536-1455
- Enumerated
- Jul 19, 2005
- Record last updated
- Dec 7, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (516) 536-1598
- Medicaid ID
- 00479570 NY
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,163 in New York → Look up another NPI →
Also registered at 242 Merrick RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Marjory David, FNPFamily Nurse Practitioner1801996335
Verify Leonard Kessler 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 127415Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
11 Medicare Part D claims, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Leonard Kessler among 1,163 hematology & oncology physician records in New York
Leonard Kessler, MD is one of 1,163 hematology & oncology physician records with a practice address in New York. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2009 · 61% 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 New York 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 New York
There are 1,163 hematology & oncology physician records in New York.
All 1,163 in New York → Every provider in Rockville Centre → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Mohammed Ali, MDRockville Center, NY 115701205817335
- Kenneth Angelino, M.D.Rockville Centre, NY 115701376802405
- David DroryRockville Centre, NY 115701003444589
- Valerie Kremer, M.D.Rockville Centre, NY 115701134445497
- Richard Lee, MDRockville Centre, NY 115701033118229
- Abdul Mundia, MDRockville Centre, NY 115701669672101
- Ronald Primis, M.D.Rockville Centre, NY 115701730188343
- Abhinav Rohatgi, MDRockville Centre, NY 115701073990107
Common questions
What is Leonard Kessler, MD's NPI number?
Leonard Kessler, MD's National Provider Identifier (NPI) is 1942209135, issued on Jul 19, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Leonard Kessler, MD located?
The NPPES record lists a practice address at 242 Merrick RD, Rockville Centre, NY, 11570. Phone: (516) 536-1455. Providers update this record themselves, so call before visiting.
How can I verify Leonard Kessler, MD's license?
NPPES lists New York license number 127415, 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 Leonard Kessler, MD prescribe under Medicare Part D?
In 2024, Leonard Kessler, MD had 11 Medicare Part D claims; the average among hematology & oncology physician prescribers was 877. 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.