Physician Profile
Andreas Stefan, M.D.
Unclaimed ProfileAbout 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.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
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
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
- Acute pancreatitis
- Gallstones
- Pancreatic cysts
- Primary sclerosing cholangitis
Colon and anorectal
- Anal fissure
- Colon cancer
- Colon polyps
- Lower gastrointestinal bleeding
Esophagus and swallowing
- Barrett's esophagus
- Eosinophilic esophagitis
- Esophageal stricture
- Esophagitis
Functional bowel and motility
- Chronic diarrhea
- Fecal incontinence
- Small intestinal bacterial overgrowth
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
- Functional dyspepsia
- Gastritis
- Gastroparesis
- H. pylori infection
- Peptic ulcer disease
Bowel & Colon
- Diverticulitis
Digestive Symptoms
- Constipation
Gallbladder & Bile Ducts
- Blocked Bile Duct
Procedures & services
Most searched procedures
- Colonoscopy
- Endoscopy
- Gallbladder removal
- Hernia repair
- Liver biopsy
Lower endoscopy
- Colon polyp removal
- Endoscopic control of gastrointestinal bleeding
- Flexible sigmoidoscopy
Upper endoscopy
- Endoscopic submucosal dissection
- Esophageal dilation
Capsule and physiology testing
- Anorectal manometry
- Capsule endoscopy
- Esophageal manometry
Diagnostic Testing
- 24-Hour Acid Reflux Test
- EUS-Guided Fine Needle Biopsy
- H. Pylori Breath Test
- SIBO Breath Test
Liver procedures
- Esophageal variceal banding
- Liver elastography
- Paracentesis
Treatments
- Stool Transplant
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. Guide.md cannot book appointments or pass on messages — please call the office directly.
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.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.