Mark Fesenmyer, MD
Gastroenterology Physician · Merrillville, IN
Mark Fesenmyer, MD is a gastroenterology physician with a practice address in Merrillville, Indiana, and NPI 1992770390, issued on Feb 20, 2006. Check the license (Indiana 01072085A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Mark Fesenmyer
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 01072085A IN
036105597 IL
Self-reported in NPPES; status is on the state search - Practice location
- 8895 Broadway, Merrillville, IN 46410
- Phone
- (219) 738-2081
- Enumerated
- Feb 20, 2006
- Record last updated
- May 5, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (219) 736-4658
- Medicaid IDs
- 036105597 IL
201131780A IN - Medicare enrollment
- Enrolled (PECOS I20130429000622); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 1991
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 372 in Indiana → Look up another NPI →
Also registered at 8895 Broadway
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Krystal Baum, FNP-CFamily Nurse Practitioner1346601168
- Tamara Elkins, FNPFamily Nurse Practitioner1922076702
- Sharon Harig, MDPulmonary Disease Physician1770585861
- Marianne Schallmo, ANPNurse Practitioner1679508410
- Aaditya Shah, MDRetina Specialist (Ophthalmology) Physician1124688221
- Ahmad Shughoury, MDGastroenterology Physician1356343578
Verify Mark Fesenmyer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01072085ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% more Medicare Part D claims than the average gastroenterology physician in 2024
1,432 Medicare Part D claims for 545 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium321 claims
- Gavilyte-C219 claims
- Omeprazole165 claims
- Nortriptyline Hcl87 claims
- Dicyclomine Hcl78 claims
- Metoclopramide Hcl62 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,125.37
56 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Community Care Network IncHobart, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Fesenmyer among 372 gastroenterology physician records in Indiana
Mark Fesenmyer, MD is one of 372 gastroenterology physician records with a practice address in Indiana. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 17% of them.
- NPI issued2006 · 17% of these records are older, 47% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1991 · median 2001 among the 272 with a school on file
- Record last updated2020 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Indiana
There are 372 gastroenterology physician records in Indiana.
All 372 in Indiana → Every provider in Merrillville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Muhammad Alsayid, M.D.Merrillville, IN 464101326356411
- Rahul Julka, M.D.Merrillville, IN 464101235216425
- John Mirro, MDMerrillville, IN 464101689678955
- Ahmad Shughoury, MDMerrillville, IN 464101356343578
- Kumar Venkatachalam, MDMerrillville, IN 464101154325421
- Christine Bruno, MDValparaiso, IN 463831982770707
- Anish Chopra, MDValparaiso, IN 463831962616409
- Thomas Hall, M.D.Valparaiso, IN 463831568434959
Common questions
What is Mark Fesenmyer, MD's NPI number?
Mark Fesenmyer, MD's National Provider Identifier (NPI) is 1992770390, issued on Feb 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Fesenmyer, MD located?
The NPPES record lists a practice address at 8895 Broadway, Merrillville, IN, 46410. Phone: (219) 738-2081. Providers update this record themselves, so call before visiting.
How can I verify Mark Fesenmyer, MD's license?
NPPES lists Indiana license number 01072085A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Fesenmyer, MD prescribe under Medicare Part D?
In 2024, Mark Fesenmyer, MD had 1,432 Medicare Part D claims for 545 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.