John Tloczkowski, MD
Endocrinology, Diabetes & Metabolism Physician · Greenlawn, NY
John Tloczkowski, MD is an endocrinology, diabetes & metabolism physician with a practice address in Greenlawn, New York, and NPI 1730402702, issued on Mar 5, 2010. Check the license (New York 257389, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- John Tloczkowski
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 257389 NY
Self-reported in NPPES; status is on the state search - Practice location
- 5 Cuba Hill RD, Greenlawn, NY 11740
- Phone
- (631) 628-5000
- Enumerated
- Mar 5, 2010
- Record last updated
- Dec 7, 2023
- Medicare enrollment
- Enrolled (PECOS I20120615000396); accepts Medicare assignment
- Medical or professional school
- State University Of Ny Upstate Medical University, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 970 in New York → Look up another NPI →
Also registered at 5 Cuba Hill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Eric Arguelles, MDCardiovascular Disease Physician1104138627
- Neha Arora, D.O.Endocrinology, Diabetes & Metabolism Physician1275953572
- Eric BallecerGastroenterology Physician1760833602
- Mathew Birnbaum, MDDermatology Physician1306334388
- Tyler Cappello, MDInternal Medicine Physician1538746896
Verify John Tloczkowski 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 257389Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average endocrinology, diabetes & metabolism physician in 2024
7,693 Medicare Part D claims for 960 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
- Levothyroxine Sodium856 claims
- Mounjaro645 claims
- Synthroid507 claims
- Metformin Hcl Er441 claims
- Ozempic406 claims
- Metformin Hcl402 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
- North Shore Medical Group OF The Mount Sinai School OF MedicineHuntington, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Tloczkowski among 970 endocrinology, diabetes & metabolism physician records in New York
John Tloczkowski, 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. Its NPI, issued in 2010, is newer than 62% of them.
- NPI issued2010 · 62% of these records are older, 35% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2007 · median 2004 among the 694 with a school on file
- Record last updated2023 · 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).
3 endocrinology, diabetes & metabolism physician records list a practice address in Greenlawn
They are 3 of the 205 NPPES records with a practice address in Greenlawn, and 970 endocrinology, diabetes & metabolism physician records in New York.
All 970 in New York → Every provider in Greenlawn → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Neha Arora, D.O.Greenlawn, NY 117401275953572
- Maria Davila, M.D.Greenlawn, NY 117401659643104
- Michael Balkin, MDHuntington, NY 117431861565780
- Gary Trager, MDHuntington, NY 117431659442499
- Zimu Zheng, MDHuntington, NY 117431811054893
- Rachel Pessah Pollack, M.D.Huntington Station, NY 117461669632196
- Harold Carlson, M.D.East Setauket, NY 117331194750034
- Alan Chang, M.D.East Setauket, NY 117331649408675
Common questions
What is John Tloczkowski, MD's NPI number?
John Tloczkowski, MD's National Provider Identifier (NPI) is 1730402702, issued on Mar 5, 2010. An NPI identifies a provider in billing; it is not a license.
Where is John Tloczkowski, MD located?
The NPPES record lists a practice address at 5 Cuba Hill RD, Greenlawn, NY, 11740. Phone: (631) 628-5000. Providers update this record themselves, so call before visiting.
How can I verify John Tloczkowski, MD's license?
NPPES lists New York license number 257389, 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 John Tloczkowski, MD prescribe under Medicare Part D?
In 2024, John Tloczkowski, MD had 7,693 Medicare Part D claims for 960 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.