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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 (6)

The overall average patient rating of Dr. Howard Hack is Good. Dr. Hack has been reviewed by 17 patients who have provided 6 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 3.4
Promptness 3.3
Courteous Staff 3.7
Accurate Diagnosis 3.4
Bedside Manner 3.1
Spends Time with Me 3.4
Follows Up After Visit 3.5

Specialties & Research

Dr. Howard Hack, MD is board certified in Gastroenterology.

  • He has special expertise in 5 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Hack graduated from Washington University at St. Louis, Saint Louis.


Dr. Hack has 10 hospital affiliations:

  • Columbia Hospital, Inc. 
  • St Elizabeth Medical Center 


  • English

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Additional Information
Dr. Howard Mark Hack MD is a male Internist, has 24 years of experience and practices in Gastroenterology.
Where does Dr. Howard M. Hack practice?
Dr. Howard Hack has 2 office locations.
Dr. Howard Hack practices Gastroenterology near Paradise, CA.
Additional practice locations include: Fort Wayne, IN.
See Paradise Gastroenterologists.