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Edit this profileAt a glance
- 161 Marginal Way, Portland, ME 04101
About Dr. Stefan
Andreas Stefan, M.D. practices gastroenterology in Portland, ME. Andreas is a 1991 graduate of University of Minnesota Medical School. According to Medicare claims data, Andreas cared for 716 Medicare patients across 958 services. The services billed most often include pathology examination of tissue using a microscope, intermediate complexity, moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monit, and removal of polyps or growths of large bowel using an endoscope with mechanical snare. The provider's National Provider Identifier (NPI) is 1831299460.
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
- (207) 773-7964
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
161 MARGINAL WAY
Portland, ME 04101
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
958 services · 716 patients · 17 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
101 | More often than most peers in Gastroenterology |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
56 | As often as other peers in Gastroenterology |
| Removal of stone or debris from bile or pancreatic duct using a flexible endoscope | Procedure | 43264 |
47 | More often than most peers in Gastroenterology |
| Insertion of stent into pancreatic or bile duct using a flexible endoscope | Procedure | 43274 |
40 | More often than most peers in Gastroenterology |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
38 | As often as other peers in Gastroenterology |
| Incision of pancreatic outlet using a flexible endoscope | Procedure | 43262 |
27 | More often than most peers in Gastroenterology |
| Biopsy of gallbladder, pancreatic, liver, and bile ducts using a flexible endoscope | Procedure | 43261 |
22 | More often than most peers in Gastroenterology |
| Exam of common bile and/or pancreatic duct using a flexible endoscope | Procedure | 43273 |
17 | As often as other peers in Gastroenterology |
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
16 | Less often than most peers in Gastroenterology |
| Removal of stent from pancreatic or bile duct using a flexible endoscope | Procedure | 43275 |
14 | As often as other 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.
Other gastroenterologists at this location 8
Same specialty, same street address — most likely the same department or group.
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 Portland 3
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at University of Minnesota Medical School 8
Other providers in the same specialty who trained at the same institution.
Class of 1991 at University of Minnesota Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Removal of polyps or growths of large bowel using an endoscope with mechanical snare 8
Providers in ME who bill this service to Medicare most often.
Common questions
What does Andreas Stefan specialize in?
Andreas Stefan is a gastroenterologist in Portland, ME. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where is Andreas Stefan located?
Andreas Stefan is listed at 161 Marginal Way, Portland, ME 04101. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Andreas Stefan's phone number?
The number on file is (207) 773-7964. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Andreas Stefan's NPI number?
Andreas Stefan's National Provider Identifier is 1831299460. 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
Where did Andreas Stefan train?
Andreas Stefan attended University of Minnesota Medical School, graduating in 1991. This comes from the CMS National Downloadable File.
CMS public data
How long has Andreas Stefan been practicing?
Andreas Stefan has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What does Andreas Stefan do most often?
According to Medicare billing data, Andreas Stefan performs procedures including removal of polyps or growths of large bowel using an endoscope with mechanical snare, biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope and removal of stone or debris from bile or pancreatic duct using a flexible endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Andreas Stefan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Andreas Stefan. If this is you, claiming it is free.
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