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Edit this profileAt a glance
- 111 N Maplemere Rd Ste 200, Williamsville, NY 14221
About Dr. St Marie
Mark S. St Marie, MD is a healthcare provider in Williamsville, NY specializing in gastroenterology. According to Medicare claims data, Mark cared for 95 Medicare patients across 131 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, telephone medical discussion with physician, 21-30 minutes, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. This provider record is associated with NPI 1629150792.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (716) 626-2644
- Email not available
Practice Locations
111 N MAPLEMERE RD STE 200
Williamsville, NY 14221
Conditions Commonly Evaluated or Treated
Within Gastroenterology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Chronic conditions
Liver health
Specialized and cancer
Wound care
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
Colon and anorectal
Esophagus and swallowing
Functional bowel and motility
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
Procedures & services
Advanced endoscopy
Biliary and pancreatic endoscopy
Capsule and physiology testing
- Ambulatory reflux monitoring
- Capsule endoscopy
- Hydrogen and methane breath testing
- Anorectal manometry
- Esophageal manometry
Chronic illness
Clinical Nutrition
Diagnostic Testing
Digestive
General surgery
Infection & Microbiology Tests
Liver procedures
Lower endoscopy
- Colon polyp removal
- Diagnostic colonoscopy
- Endoscopic control of gastrointestinal bleeding
- Flexible sigmoidoscopy
Nursing care
Nutrition & Digestion
Upper endoscopy
- Endoscopic mucosal resection
- Esophageal biopsy
- Esophageal dilation
- Stomach biopsy
- Endoscopic submucosal dissection
Most searched procedures
Treatments
Procedures Most Often Billed to Medicare
131 services · 95 patients · 3 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
77 | More often than most peers in Gastroenterology |
| Telephone medical discussion with physician, 21-30 minutes | Office visit | 99443 |
39 | More often than most peers in Gastroenterology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
15 | Less often than most peers in Gastroenterology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other gastroenterologists in Williamsville 8
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1976 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Dr. St Marie's specialty?
Dr. St Marie is a gastroenterologist in Williamsville, NY. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where can I find Dr. St Marie?
Dr. St Marie is listed at 111 N Maplemere Rd Ste 200, Williamsville, NY 14221. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. St Marie?
The number on file is (716) 626-2644. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. St Marie's NPI number?
Dr. St Marie's National Provider Identifier is 1629150792. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. St Marie's medical education?
Dr. St Marie attended Other, graduating in 1976. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. St Marie been practicing?
Dr. St Marie has 50 years experience. Calculated from a graduation year of 1976, reported in the CMS National Downloadable File.
CMS public data
What is Dr. St Marie known for?
According to Medicare billing data, Dr. St Marie the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. St Marie confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. St Marie. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.