Leonard Kessler, MD
NPI 1942209135 · Hematology & Oncology Physician · Rockville Centre, NY
Leonard Kessler, MD is a Hematology & Oncology Physician provider in Rockville Centre, NY (NPI 1942209135).
Provider details
- NPI number
- 1942209135
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 127415 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-19
- Last updated
- 2009-12-07
Frequently asked questions
- What is Leonard Kessler's NPI number?
- Leonard Kessler's National Provider Identifier (NPI) is 1942209135, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Kessler's specialty?
- Leonard Kessler is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Leonard Kessler located?
- Leonard Kessler's practice location on file with NPPES is 242 Merrick Rd, Rockville Centre, NY 11570-5254.
- What is Leonard Kessler's phone number?
- The practice phone number listed in the NPPES registry for Leonard Kessler is (516) 536-1455.
- Is Leonard Kessler's NPI active?
- Yes — Leonard Kessler's NPI (1942209135) is active in the NPPES registry as of the last update on 2009-12-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.