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LEON ITWAR DO
NPI 1356964258
Internal Medicine - Endocrinology, Diabetes & Metabolism in New Hyde Park, NY

Active since May 26, 2020PECOS EnrolledAccepts Medicare Assignment
1999 MARCUS AVE STE 212, NEW HYDE PARK, NY 11042(516) 467-8600(929) 455-9855 Get Directions Write a Review

NPPES record last updated: July 10, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 10, 2025, May 26, 2020 (2 updates tracked since 2020).

About Leon Itwar Do NPPES

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

LEON ITWAR DO (NPI 1356964258) is an individual endocrinology, diabetes & metabolism provider in New Hyde Park, New York, licensed in New York (337425) and active in the NPI registry since May 2020. He is enrolled in Medicare PECOS, is affiliated with Nyu Langone Hospitals, and is a graduate of Other (2020).

NPPES Registry Identity

NPI1356964258
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameLEON ITWARCredential: DO
Location Address1999 MARCUS AVE STE 212New Hyde Park, NY 11042-1021
Mailing Address700 Hicksville Rd Ste 205Bethpage, NY 11714-3472
Phone(516) 467-8600
Fax(929) 455-9855
Sole ProprietorNo
Medical School CMSOtherGraduated 2020
Enumeration DateMay 26, 2020
Last NPPES UpdateJuly 10, 20252 updates tracked since enumeration
NPPES CertifiedJuly 10, 2025
✔ NPI 1356964258 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in NY · 337425
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
1999 MARCUS AVE STE 212, New Hyde Park, NY 11042
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Leon Itwar Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6608220371
PECOS Enrollment IDI20250718002012
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Nyu Langone Hospitals

Acute Care Hospitals · New York, NY
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330214
Location550 First AvenueNew York, NY 10016 · New York County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11042 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
$154.28 typical visit price
range $67.40 – $203.53
Typical copayment $38.57 (range $16.85 – $50.88)
Most-billed visit code 99204
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

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

DR. RORY STEVEN BREIDBART MD
Internal Medicine (Endocrinology, Diabetes & Metabolism)
1999 MARCUS AVE STE 212
NEW HYDE PARK, NY 11042
Nassau County (516) 467-8600

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 Leon Itwar's NPI number?

The NPI number for Leon Itwar is 1356964258. It was assigned to this individual provider in the NPPES registry on May 26, 2020.

Where is Leon Itwar located?

Leon Itwar practices at 1999 Marcus Ave Ste 212, New Hyde Park, NY 11042. The listed phone number is (516) 467-8600.

What is Leon Itwar's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Leon Itwar enrolled in Medicare?

Yes. Leon Itwar is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Is Leon Itwar affiliated with any hospitals?

According to CMS data, Leon Itwar is affiliated with Nyu Langone Hospitals.

When was this NPI record last updated?

The NPPES record for Leon Itwar was last updated on July 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.