Mark Stephen Lemert, M.D.
Gastroenterology Physician · New York, NY
Mark Stephen Lemert, M.D. is a gastroenterology physician with a practice address in New York, New York, and NPI 1306810478, issued on Feb 15, 2006. Check the license (New York 236488, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark Stephen Lemert
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 236488 NY
MD26758 ME
Self-reported in NPPES; status is on the state search - Practice location
- 317 E 34TH St, New York, NY 10016
- Phone
- (212) 726-7412
- Enumerated
- Feb 15, 2006
- Record last updated
- Feb 20, 2024
- Fax
- (212) 981-7212
- Medicare enrollment
- Enrolled (PECOS I20070130000122); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,797 in New York → Look up another NPI →
Also registered at 317 E 34TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mitchell Adler, MDInternal Medicine Physician1881699791
- Olubunmi Afonja, MB, BSPediatric Hematology & Oncology Physician1194719492
- Eileen Alexander, M.D.Pediatrics Physician1447488150
- Jeffrey Allen, MDPediatric Hematology & Oncology Physician1154397727
- Robert Anolik, MDSpecialist1932314929
- Ann Aurigemma, NPPediatric Nurse Practitioner1013887330
Verify Mark Stephen Lemert 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 236488Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average gastroenterology physician in 2024
364 Medicare Part D claims for 183 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Omeprazole76 claims
- Gavilyte-G58 claims
- Clenpiq34 claims
- Balsalazide Disodium27 claims
- Peg 3350-Electrolyte25 claims
- Pantoprazole Sodium19 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).
Mark Stephen Lemert among 1,797 gastroenterology physician records in New York
Mark Stephen Lemert, M.D. is one of 1,797 gastroenterology physician records with a practice address in New York. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 15% of them.
- NPI issued2006 · 15% of these records are older, 44% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1997 · median 1999 among the 1,378 with a school on file
- Record last updated2024 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in New York
There are 1,797 gastroenterology physician records in New York.
All 1,797 in New York → Every provider in New York → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- John Ackert, MDNew York, NY 100161053335810
- Daniel Alpert, MDNew York, NY 100161063412708
- Steven Field, MDNew York, NY 100161871591784
- Seth Gross, M.D.New York, NY 100161154304111
- Min-Tsung Hsu, MDNew York, NY 100161376520486
- Basil Lucak, M.D.New York, NY 100161720071145
- Marc Obadia, MDNew York, NY 100161487627824
- Kenneth Pearlman, MDNew York, NY 100161770585952
Common questions
What is Mark Stephen Lemert, M.D.'s NPI number?
Mark Stephen Lemert, M.D.'s National Provider Identifier (NPI) is 1306810478, issued on Feb 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Stephen Lemert, M.D. located?
The NPPES record lists a practice address at 317 E 34TH St, New York, NY, 10016. Phone: (212) 726-7412. Providers update this record themselves, so call before visiting.
How can I verify Mark Stephen Lemert, M.D.'s license?
NPPES lists New York license number 236488, 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 Mark Stephen Lemert, M.D. prescribe under Medicare Part D?
In 2024, Mark Stephen Lemert, M.D. had 364 Medicare Part D claims for 183 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.