John Leff, MD
Endocrinology, Diabetes & Metabolism Physician · Brooklyn, NY
John Leff, MD is an endocrinology, diabetes & metabolism physician with a practice address in Brooklyn, New York, and NPI 1689693327, issued on Jul 19, 2006. Check the license (New York 143472, as entered in NPPES) on the NYS Education Department, Office of the Professions; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Leff
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 143472 NY
Self-reported in NPPES; status is on the state search - Practice location
- Lutheran Medical Center, Brooklyn, NY 11220
- Phone
- (718) 630-7369
- Enumerated
- Jul 19, 2006
- Record last updated
- Jan 17, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (718) 630-6286
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 970 in New York → Look up another NPI →
Also registered at Lutheran Medical Center
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Idoko Salifu, MD, MPHSpecialist1255645503
Verify John Leff 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 143472Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Leff among 970 endocrinology, diabetes & metabolism physician records in New York
John Leff, MD 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 not. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 57% newer
- In a Medicare fileNo · 86% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2012 · 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. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 970 in New York → Every provider in Brooklyn → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Ying Chen, MDBrooklyn, NY 112201497384960
- Thinzar Lin, MDBrooklyn, NY 112201932509205
- Vladimir Privman, MDBrooklyn, NY 112201659333193
- Alan Brickman, M.D.Brooklyn, NY 112191104917343
- Jocelyne Karam, MDBrooklyn, NY 112191982894978
- Tiffany Lu, DOBrooklyn, NY 112191255969077
- Geeti Mahajan, M.D.Brooklyn, NY 112191538320510
- Luba Rakhlin, M.D.Brooklyn, NY 112191548569320
Common questions
What is John Leff, MD's NPI number?
John Leff, MD's National Provider Identifier (NPI) is 1689693327, issued on Jul 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Leff, MD located?
The NPPES record lists a practice address at Lutheran Medical Center, Brooklyn, NY, 11220. Phone: (718) 630-7369. Providers update this record themselves, so call before visiting.
How can I verify John Leff, MD's license?
NPPES lists New York license number 143472, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.