Dr. Leon Itwar, DO
- Part D claims, 2024
- 594
- Hospital affiliations
- 1
- Industry payments
- $44
- Medical group
- 1
- State license
- 1
- Practice address
- 14 Wall St, New York, NY 10005
- Practice phone
- Call (212) 263-1481
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
NYU Langone Perlmutter Cancer Center - 34th St
New York, New York
Find Dr. Itwar's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Leon Itwar is an endocrinologist in New York, New York
Dr. Itwar practices at NYU Langone Perlmutter Cancer Center - 34th St in New York, New York.
Dr. Itwar's NPI, 1356964258, was assigned on May 26, 2020. Dr. Itwar holds New York license 337425.
- NPI
- 1356964258NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6608220371
- NPI enumeration date
- May 26, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (212) 263-1481
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Leon Itwar practices at NYU Langone Perlmutter Cancer Center - 34th St in New York, New York
Dr. Itwar's primary practice is NYU Langone Perlmutter Cancer Center - 34th St, at 14 Wall St, New York, NY 10005 in New York County. The practice phone is (212) 263-1481.
- NYU Langone Perlmutter Cancer Center - 34th St14 Wall St, New York, NY 10005 · New York CountyPhone(212) 263-1481
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Leon Itwar is affiliated with 3 sites of care and 1 medical group
Dr. Itwar's primary practice is NYU Langone Perlmutter Cancer Center - 34th St in New York, New York. Dr. Itwar is also affiliated with Tisch Hospital. The medical group on file is NYU Langone Orthopedic Surgery Associates. Dmand AI also links Dr. Itwar to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Leon Itwar's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Itwar practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| NYU Langone Perlmutter Cancer Center - 34th St | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Leon Itwar is one of 835 endocrinologists in New York
Endocrinology, diabetes and metabolism is Dr. Itwar's primary specialty in the NPI Registry, under taxonomy code 207RE0101X. Dr. Itwar is licensed in New York.
Specialties and state licenses
- Endocrinology, diabetes and metabolism, New YorkPrimary
Endocrinologists near Dr. Itwar
Counts of endocrinologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Leon Itwar's patients have a median age of 52
Across all payers, Dmand AI patient panel data puts Dr. Itwar's median patient age at 52, with 69% women.
Dr. Itwar's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women69%
- Men29%
Source: Dmand AI Patient Panel Data
Dr. Leon Itwar wrote 594 Medicare Part D claims in 2024
In 2024, Dr. Itwar wrote 594 Medicare Part D claims for 111 patients. 43% of them were for generic drugs. CMS names the drug for 385 of them, across 14 drugs with 11 or more claims each, at $204,852 in total drug cost.
Dr. Itwar's Part D claims by kind of drug, 2024
- Generic255 claims43%
- Brand-name278 claims47%
- Other61 claims10%
Dr. Itwar's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Leon Itwar takes part in Medicare
Dr. Itwar accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Leon Itwar received $44 in industry payments in 2025
CMS Open Payments shows 2 general payments to Dr. Itwar from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $44.
Companies that paid Dr. Itwar the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Leon Itwar's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Leon Itwar
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Leon Itwar's NPI number?
Dr. Leon Itwar's NPI number is 1356964258. It was assigned on May 26, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Leon Itwar?
Dr. Leon Itwar is an endocrinologist in New York, New York. The primary specialty in the NPI Registry is Endocrinology, Diabetes & Metabolism Physician (taxonomy code 207RE0101X).
Where does Dr. Leon Itwar practice?
Dr. Itwar practices at 14 Wall St, New York, NY 10005. Dr. Itwar's primary practice is NYU Langone Perlmutter Cancer Center - 34th St in New York, New York. Dmand AI also links Dr. Itwar to 1 group practice or clinic.
What is Dr. Leon Itwar's office phone number?
The practice phone on file for Dr. Itwar is (212) 263-1481.
What is Dr. Leon Itwar's medical license number?
Dr. Itwar holds New York license 337425.
Which hospitals is Dr. Leon Itwar affiliated with?
Dr. Itwar is affiliated with Tisch Hospital.
What medical group is Dr. Leon Itwar part of?
Dr. Itwar is linked to NYU Langone Orthopedic Surgery Associates.
Does Dr. Leon Itwar accept Medicare?
Yes. CMS lists Dr. Itwar as accepting Medicare assignment.
What drugs does Dr. Leon Itwar prescribe most?
In 2024 Medicare Part D data, Dr. Itwar's most prescribed drugs by claims were Trulicity, Levothyroxine Sodium and Ozempic.
Has Dr. Leon Itwar received payments from drug or device companies?
CMS Open Payments shows $44 in general payments to Dr. Itwar from 1 company from 2025 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Leon Itwar been practicing?
Dr. Itwar graduated from medical school in 2020, 6 years ago.
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