Mark Riley Jonker, M.D.
NPI 1780030452ActiveIndividual· Internal Medicine· Hartford, CT
Internal Medicine (M.D.) with Middlesex Hospital, practicing in Hartford, Connecticut. In 2024 Medicare paid $52,366 for 204 patients, and Part D covered 225 of their prescriptions, 88% of them generic. E.R. Squibb & Sons, L.L.C. reported $23.81 in payments in 2025, mostly food and beverage. Lists Griffin Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1780030452 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 11, 2016 |
| Last updated in NPPES | Jun 3, 2020 |
| Certified by provider | Jun 3, 2020 |
| Reactivated | Feb 22, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 64205 | CT |
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 - Internal Medicine (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 204 |
|---|---|
| Services billed | 656 across 8 procedure codes |
| Paid by Medicare | $52,366 |
Part D prescriptions in 2024
| Prescriptions (claims) | 225 · 241 30-day fills |
|---|---|
| Patients | 101 |
| Total drug cost | $15,704 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2016 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Middlesex HospitalMiddletown, CT · 234 clinicians
Hospital affiliations
- Griffin HospitalDerby, CT
- Middlesex HospitalMiddletown, CT
Industry payments (Open Payments)
- 2025$23.81 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| E.R. Squibb & Sons, L.L.C. | $23.81 | 1 |
What the 2025 payments were for
- Food and Beverage$23.81 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 185 internal medicine physicians in Hartford · All internal medicine physicians in Connecticut