Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mark Fesenmyer, MD

Individual provider Gastroenterology Physician · NPI 1992770390

Mark Fesenmyer, MD is a Gastroenterology in Merrillville, Indiana. Graduated from Indiana University School of Medicine in 1991, 35 years ago. Practices with Community Care Network Inc, a 374-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Illinois and Indiana.

Years since qualifying
35
Trained at
Indiana University School of Medicine
Licensed in
IL, IN
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

8895 Broadway
Merrillville, IN 46410-7037
Phone: (219) 738-2081
Fax: (219) 736-4658
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 7835 Grand Blvd, Hobart, IN 46342-6665 — (219) 947-6795
  • 3800 Saint Mary Rd Ste 101, Valparaiso, IN 46383-3986 — (219) 947-6795

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 01072085A (IN)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 036105597 (IL)

Record details

NPI number1992770390
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 20, 2006
Last updated in NPPESMay 5, 2020
Certification dateMay 5, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGASTROENTEROLOGY
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1991 (35 years in practice)
Group practice Community Care Network Inc — 374 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Merrillville