Mark Stephen St Marie, MD
Gastroenterology Physician · Williamsville, NY
Mark Stephen St Marie, MD is a gastroenterology physician with a practice address in Williamsville, New York, and NPI 1629150792, issued on Oct 19, 2006. Check the license (New York 136312, 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 St Marie
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 136312 NY
Self-reported in NPPES; status is on the state search - Practice location
- 111 N Maplemere RD Ste 200, Williamsville, NY 14221
- Phone
- (716) 626-2644
- Enumerated
- Oct 19, 2006
- Record last updated
- Aug 27, 2024
- Medicare enrollment
- Enrolled (PECOS I20120223000556); accepts Medicare assignment
- 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 111 N Maplemere RD Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Miranda ButlerFamily Nurse Practitioner1790629475
- Courtney Cardinal-Karp, PHARMDPharmacist1073022877
- Randy Cheung, MDGastroenterology Physician1720540883
- Gina Mangione, MDInternal Medicine Physician1821594151
- Chidimma Oduwegwu, M.D.Internal Medicine Physician1992154942
- Jordan Verrall, FNPFamily Nurse Practitioner1902578313
Verify Mark Stephen St Marie 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 136312Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
34% more Medicare Part D claims than the average gastroenterology physician in 2024
1,087 Medicare Part D claims for 242 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Famotidine211 claims
- Omeprazole203 claims
- Pantoprazole Sodium184 claims
- Dicyclomine Hcl149 claims
- Loperamide35 claims
- Mesalamine30 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.
Industry payments in 2024: $590.26
14 payments; by number, the most common kind was food and beverage; the largest payer was Phathom Pharmaceuticals, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- General Physician PCWilliamsville, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Stephen St Marie among 1,797 gastroenterology physician records in New York
Mark Stephen St Marie, MD 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
- Graduated1976 · 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 Williamsville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Christopher Bartolone, M.D.Williamsville, NY 142211548246788
- Peter Bloom, M.D.Williamsville, NY 142211316923253
- Joseph Caruana, M.D.Williamsville, NY 142211134123417
- James Corasanti, MD, PHDWilliamsville, NY 142211750347068
- David Fay, M.D.Williamsville, NY 142211942286844
- David Garson, M.D.Williamsville, NY 142211457337388
- Jerald Giller, M.D.Williamsville, NY 142211376529370
- Richard Kaplan, M.D.Williamsville, NY 142211184600975
Common questions
What is Mark Stephen St Marie, MD's NPI number?
Mark Stephen St Marie, MD's National Provider Identifier (NPI) is 1629150792, issued on Oct 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Stephen St Marie, MD located?
The NPPES record lists a practice address at 111 N Maplemere RD Ste 200, Williamsville, NY, 14221. Phone: (716) 626-2644. Providers update this record themselves, so call before visiting.
How can I verify Mark Stephen St Marie, MD's license?
NPPES lists New York license number 136312, 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 St Marie, MD prescribe under Medicare Part D?
In 2024, Mark Stephen St Marie, MD had 1,087 Medicare Part D claims for 242 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.