Leon Itwar, DO
Endocrinology, Diabetes & Metabolism Physician · New Hyde Park, NY
Leon Itwar, DO is an endocrinology, diabetes & metabolism physician with a practice address in New Hyde Park, New York, and NPI 1356964258, issued on May 26, 2020. Check the license (New York 337425, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Leon Itwar
- Credential
- DO
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 337425 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1999 Marcus Ave Ste 212, New Hyde Park, NY 11042
- Phone
- (516) 467-8600
- Enumerated
- May 26, 2020
- Record last updated
- Jul 10, 2025
- Fax
- (929) 455-9855
- Medicare enrollment
- Enrolled (PECOS I20250718002012); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 970 in New York → Look up another NPI →
Also registered at 1999 Marcus Ave Ste 212
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rory Breidbart, MDEndocrinology, Diabetes & Metabolism Physician1285600973
Verify Leon Itwar 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 337425Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
594 Medicare Part D claims for 111 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 47% of claims.
Most prescribed
- Trulicity69 claims
- Levothyroxine Sodium66 claims
- Ozempic55 claims
- Metformin Hcl Er43 claims
- Testosterone25 claims
- Atorvastatin Calcium23 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.
Bills Medicare through one group practice
- New York UniversityNew York, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leon Itwar among 970 endocrinology, diabetes & metabolism physician records in New York
Leon Itwar, DO is one of 970 endocrinology, diabetes & metabolism physician records with a practice address in New York. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 93% of them.
- NPI issued2020 · 93% of these records are older, 3% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2020 · median 2004 among the 694 with a school on file
- Record last updated2025 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in New York
There are 970 endocrinology, diabetes & metabolism physician records in New York.
All 970 in New York → Every provider in New Hyde Park → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Dipa Avichal, D.O.Lake Success, NY 110421881074060
- Tatiana Baron, D.O.New Hyde Park, NY 110421790922888
- Rachelle Bitton, MDLake Success, NY 110421770538548
- Rory Breidbart, MDNew Hyde Park, NY 110421285600973
- Russell Dambra, MDNew Hyde Park, NY 110421154381929
- Martin Greenfield, MDNew Hyde Park, NY 110421205831443
- Dihan Heron, M.D.New Hyde Park, NY 110421902006398
- Kenneth Hershon, MDNew Hyde Park, NY 110421255391017
Common questions
What is Leon Itwar, DO's NPI number?
Leon Itwar, DO's National Provider Identifier (NPI) is 1356964258, issued on May 26, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Leon Itwar, DO located?
The NPPES record lists a practice address at 1999 Marcus Ave Ste 212, New Hyde Park, NY, 11042. Phone: (516) 467-8600. Providers update this record themselves, so call before visiting.
How can I verify Leon Itwar, DO's license?
NPPES lists New York license number 337425, 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 Leon Itwar, DO prescribe under Medicare Part D?
In 2024, Leon Itwar, DO had 594 Medicare Part D claims for 111 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.