Doctor profile · Federal record
Dr. Mark St Marie, MD
Gastroenterology Physician (CMS: Gastroenterology) · Williamsville, NY
- NPI 1629150792
- Accepts Medicare
- 50 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
111 N Maplemere RD Ste 200
Williamsville, NY 142213182
(716) 626-2644
Credentials & registration
- NPI registered
- October 2006 — 20 yrs on file
- Profile last updated
- August 27, 2024
- Year of graduation
- 1976 — 50 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- New York #136312
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1629150792. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
132
Distinct HCPCS
2
Medicare allowed
$12,493
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 89 | 58 | $81 | |
99443 |
Telephone medical discussion with physician, 21-30 minutes | 43 | 29 | $122 |
In context: peer comparison
Among 7 peers in Williamsville Gastroenterology Physician, average services per provider: 30. This provider delivers 4.4× the peer median.Open Payments
Industry payments received
All-time total
$590
Transactions
14
Manufacturers
6
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Phathom Pharmaceuticals, INC. | 2 | $248.36 | |
| Abbvie INC. | 7 | $224.65 | |
| Sandoz INC. | 2 | $61.00 | |
| Exact Sciences Corporation | 1 | $22.23 | |
| Takeda Pharmaceuticals U.S.A., INC. | 1 | $18.05 | |
| Intercept Pharmaceuticals, INC. | 1 | $15.97 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
979
Patients
242
Total drug cost
$81,608
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 217 | 68 | $5,246 |
| Dicyclomine Hcl | Generic | 188 | 54 | $4,627 |
| Famotidine | Generic | 184 | 57 | $4,416 |
| Pantoprazole Sodium | Generic | 179 | 63 | $3,241 |
| Mesalamine Dr (Mesalamine) | Brand | 34 | 0 | $12,712 |
| Cholestyramine (Cholestyramine (With Sugar)) | Brand | 30 | 0 | $1,878 |
| Mesalamine | Generic | 24 | 0 | $29,447 |
| Esomeprazole Magnesium | Generic | 23 | 0 | $4,911 |
| Metoclopramide Hcl | Generic | 20 | 0 | $290 |
| Diphenoxylate-Atropine (Diphenoxylate Hcl/Atropine) | Brand | 18 | 0 | $746 |
Frequently asked questions
What is Dr. Mark St Marie's medical specialty?
Dr. Mark St Marie practices Gastroenterology Physician in Williamsville, NY.
Where does Dr. Mark St Marie practice?
Dr. Mark St Marie practices at 111 N Maplemere RD Ste 200, Williamsville, NY 142213182. Office phone: 7166262644.
What is Dr. Mark St Marie's NPI?
Dr. Mark St Marie's National Provider Identifier (NPI) is 1629150792, issued by NPPES.
Does Dr. Mark St Marie accept Medicare assignment?
Yes. Dr. Mark St Marie accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark St Marie commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Telephone medical discussion with physician (HCPCS 99443). Source: CMS Medicare Physician & Other Practitioners file.