MARK FESENMYER (MD) – Gastroenterology Physician, NPI 1992770390
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
448 GASTROENTEROLOGY in IN
Provider Addresses for MARK FESENMYER (MD)
3800 Saint Mary Rd Ste 101
Valparaiso, IN 463833986
Phone: (219) 947-6795
Fax: (219) 703-6896
Type: Location
7835 Grand Blvd
Hobart, IN 463426665
Phone: (219) 947-6795
Fax: (219) 703-6896
Type: Location
8895, Broadway, Merrillville, Lake County, Indiana, 46410, United States
MERRILLVILLE, IN 464107037
Phone: (219) 738-2081
Fax: (219) 736-4658
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 101 Open Payments records for all available years, with a total value of $1,893.
Total Amount is formed as General ($1,893) + Research ($0) + Ownership ($0) = $1,893.
Last reported payment date: 2024-12-11 • Largest payer in this snapshot: ABBVIE INC. ($537).
Total Amount
$1,893
General + Research + Ownership
Payments
101
Total payment records
General Amount
$1,893
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-11
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $537 |
| Takeda Pharmaceuticals U.S.A., Inc. | $363 |
| Janssen Biotech, Inc. | $219 |
| Ardelyx, Inc. | $93 |
| Mallinckrodt Hospital Products Inc. | $92 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2013-04-29
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20130429000622 | I | Gastroenterology | IN | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 190 | 128 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 173 | 134 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 157 | 155 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 130 | 128 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 96 | 95 | $0 |
Insurance plans in this area (ZIP 46383)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Critical Care (Intensivists) | IL | |
| - | IN | |
| Nurse Practitioner | IN | |
| - | IN | |
| Cardiovascular Disease (Cardiology), Cardiac Electrophysiology | IL | |
| Nurse Practitioner | IN | |
| - | IN | |
| Gynecological Oncology, Obstetrics/Gynecology | IN | |
| - | IN | |
| Nurse Practitioner | IN |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.