Mark I Chieh Hong, M.D
NPI 1982048286ActiveIndividual· Internal Medicine, Nephrology· Mason City, IA
Internal Medicine, Nephrology (M.D) with North Iowa Mercy Clinics and 1 other group, practicing in Mason City, Iowa. 506 Medicare patients in 2024, $174,314 paid; nearly all of their 1,541 Part D prescriptions were generic (97%). Lists Franklin General Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1982048286 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D |
| Sole proprietor | No |
| NPI issued | Apr 17, 2013 |
| Last updated in NPPES | Jul 15, 2025 |
| Certified by provider | Jul 15, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 42588 | IA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Nephrology (IA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 506 |
|---|---|
| Services billed | 2,145 across 27 procedure codes |
| Paid by Medicare | $174,314 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,541 · 3,340 30-day fills |
|---|---|
| Patients | 325 |
| Total drug cost | $59,289 |
| Generic share | 97% of claims |
Education and affiliations
| Graduation year | 2010 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- North Iowa Mercy ClinicsMason City, IA · 302 clinicians
- Hancock County Health SystemBritt, IA · 14 clinicians
Hospital affiliations
- Franklin General HospitalHampton, IA
- Hancock County Health SystemBritt, IA
- Kossuth Regional Health CenterAlgona, IA
- Mercyone North Iowa Medical CenterMason City, IA
- Mitchell County Regional HealthOsage, IA
Other facilities
- Fmc - AlgonaDialysis facility · Algona, IA
- Fmc - Mason CityDialysis facility · Mason City, IA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other nephrologists in Mason City
- 1003082736