Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Ronald Lessen, MD

Individual provider Anesthesiology Physician · NPI 1588660328

Ronald Lessen, MD practises Anesthesiology in Manhasset, New York. Qualified in 1992, 34 years ago. Practices with North Shore - Lij Anesthesiology, PC, a 1,004-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
34
Licensed in
NY
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

300 Community Dr
Manhasset, NY 11030-3816 Not confirmed with CMS for 16 years — call before visiting
Phone: (516) 562-4887
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence 202466 (NY)

Record details

NPI number1588660328
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 27, 2005
Last updated in NPPESNovember 5, 2009

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyANESTHESIOLOGY
Medical schoolOTHER
Graduated 1992 (34 years in practice)
Group practice North Shore - Lij Anesthesiology, Pc — 1004 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients182
Services billed 199 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at North Shore - Lij Anesthesiology, PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1004 clinicians in the practice; 12 are shown here.

Other providers in Manhasset