1. Home
  2. Directory
  3. New York
  4. Rockville Centre
  5. Internal Medicine
  6. NPI Profile

LEONARD KESSLER MD
NPI 1942209135
Internal Medicine - Hematology & Oncology in Rockville Centre, NY

Active since July 19, 2005Opted out of Medicare · through Apr 1, 2027
242 MERRICK RD, SUITE 301, ROCKVILLE CENTRE, NY 11570(516) 536-1455(516) 536-1598 Get Directions Write a Review

NPPES record last updated: December 7, 2009. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Leonard Kessler Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

LEONARD KESSLER MD (NPI 1942209135) is an individual hematology & oncology provider in Rockville Centre, New York, licensed in New York (127415) and active in the NPI registry since July 2005. He has opted out of Medicare through April 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1942209135
Entity TypeIndividualMale
Primary Taxonomy207RH0003X
Provider Legal NameLEONARD KESSLERCredential: MD
Location Address242 MERRICK RD, SUITE 301Rockville Centre, NY 11570-5254
Mailing Address242 Merrick Rd, Suite 301Rockville Centre, NY 11570-5254 · (516) 536-1455 · Fax (516) 536-1598
Phone(516) 536-1455
Fax(516) 536-1598
Sole ProprietorNo
Enumeration DateJuly 19, 2005
Last NPPES UpdateDecember 7, 2009
✔ NPI 1942209135 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
License✔ Licensed in NY · 127415
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
242 MERRICK RD, Rockville Centre, NY 11570
Open in Google Maps ↗

Other Identifiers 4

Medicare UPINB12294
Medicare ID-Type Unspecified29A091
OtherW15181Group#
Medicaid00479570NY

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Leonard Kessler Md has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from April 1, 2017 through April 1, 2027.

Opt-Out Effective DateApril 1, 2017
Opt-Out In Effect ThroughApril 1, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11570 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$203.53 typical visit price
range $67.40 – $203.53
Typical copayment $50.88 (range $16.85 – $50.88)
Most-billed visit code 99205
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MS. MAUREEN IMELDA REESE PA
Physician Assistant
242 MERRICK RD
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 536-7336
MANISH B UNDAVIA M.D.
Internal Medicine (Clinical Cardiac Electrophysiology)
242 MERRICK RD, SUITE 402
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 763-2800
RICHARD HOROWITZ M.D.
Internal Medicine (Cardiovascular Disease)
242 MERRICK RD, SUITE 402
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 763-2800
RICHARD M. LEE MD
Internal Medicine (Hematology & Oncology)
242 MERRICK RD, SUITE 301
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 536-1455
VARVARA ALEXIADIS MD
Internal Medicine (Endocrinology, Diabetes & Metabolism)
242 MERRICK RD, STE 403
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 536-3700
MARK A KESSLER M.D.
Internal Medicine (Cardiovascular Disease)
242 MERRICK RD, SUITE 402
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 763-2800
DOUGLAS LAX DO
Internal Medicine (Nephrology)
242 MERRICK RD, SUITE 304
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 764-7070
ALLERGY & ASTHMA CARE OF LI, PC
Allergy & Immunology
242 MERRICK RD, SUITE 401
ROCKVILLE CENTRE, NY 11570
Nassau County (516) 536-7336

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Leonard Kessler's NPI number?

The NPI number for Leonard Kessler is 1942209135. It was assigned to this individual provider in the NPPES registry on July 19, 2005.

Where is Leonard Kessler located?

Leonard Kessler practices at 242 Merrick Rd Suite 301, Rockville Centre, NY 11570. The listed phone number is (516) 536-1455.

What is Leonard Kessler's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Leonard Kessler enrolled in Medicare?

No. Leonard Kessler has opted out of Medicare through April 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Leonard Kessler was last updated on December 7, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.