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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (4)

The overall average patient rating of Dr. Mark Fesenmyer is Good. Dr. Fesenmyer has been reviewed by 10 patients who have provided 4 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.5
Promptness 4.5
Courteous Staff 3.8
Accurate Diagnosis 3.5
Bedside Manner 3.6
Spends Time with Me 3.5
Follows Up After Visit 4.1

Specialties & Research

Dr. Mark Fesenmyer, MD is board certified in Gastroenterology.

  • He has special expertise in 8 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Colitis
  • Colon Cancer
  • Constipation
  • Heartburn
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Fesenmyer graduated from Indiana University , Indianapolis. He has 1 awards.

On-Time Doctor Award (2014)


Dr. Fesenmyer has 7 hospital affiliations:

  • Edward Hospital 
  • Advocate Good Samaritan Hospital 

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Additional Information
Dr. Mark Fesenmyer MD is a male Internist, has 21 years of experience and practices in Gastroenterology.
Where does Dr. Mark Fesenmyer practice?
Dr. Mark Fesenmyer has 4 office locations.
Dr. Mark Fesenmyer practices Gastroenterology near Merrillville, IN.
Additional practice locations include: Hobart, IN and Naperville, IL.
See Merrillville Gastroenterologists.