Mark E. Ritter, M.D.
NPI 1609939511ActiveIndividual· Internal Medicine· Chesterton, IN
Internal Medicine (M.D.) in Chesterton, Indiana, trained at Indiana University School of Medicine (class of 1986). Their prescriptions cost Medicare Part D more than their services did: $1,038,026 for 7,933 claims, against $50,726 paid for services in 2024. Novo Nordisk Inc was the largest of 3 companies reporting payments in 2025, $100.60 in all, mostly food and beverage.
Overview
| NPI | 1609939511 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Dec 19, 2006 |
| Last updated in NPPES | Sep 14, 2020 |
| Certified by provider | Sep 14, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 01037402A | IN |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Family Practice (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 221 |
|---|---|
| Services billed | 584 across 21 procedure codes |
| Paid by Medicare | $50,726 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,933 · 20,636 30-day fills |
|---|---|
| Patients | 698 |
| Total drug cost | $1,038,026 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Indiana University School of Medicine |
|---|---|
| Graduation year | 1986 |
| Medicare specialty | Family Practice |
Medical group
- Porter Physician Services LLCValparaiso, IN · 99 clinicians
Hospital affiliations
- Franciscan Health Michigan CityMichigan City, IN
- Northwest Health - PorterValparaiso, IN
- St Mary Medical Center IncHobart, IN
Other facilities
- Powers Home Health ServicesHome health agency · Hobart, IN
Industry payments (Open Payments)
- 2025$100.60 · 5 payments from 3 companies
- 2024$38.15 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $57.72 | 3 |
| Astrazeneca Pharmaceuticals LP | $22.60 | 1 |
| Pfizer Inc. | $20.28 | 1 |
What the 2025 payments were for
- Food and Beverage$100.60 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine providers in Chesterton
- 1205227840
- 1528920980
- 1538462338
- 1124562681
- 1700462652
- 1326439241
- 1811204266
- 1902891542
- 1386889921