Mariel Fahnline McGuiness, MD
NPI 1356978399ActiveIndividual· Internal Medicine· Hilliard, OH
Internal Medicine (MD) in Hilliard, Ohio, trained at Ohio State University College of Medicine (class of 2020). Their prescriptions cost Medicare Part D more than their services did: $9,322 for 98 claims, against $945.31 paid for services in 2024.
Overview
| NPI | 1356978399 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 26, 2020 |
| Last updated in NPPES | Feb 26, 2026 |
| Certified by provider | Feb 26, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 35.150329 | OH |
| Pediatrics | 208000000X | 35.150329 | OH |
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 (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 12 |
|---|---|
| Services billed | 24 across 11 procedure codes |
| Paid by Medicare | $945.31 |
Part D prescriptions in 2024
| Prescriptions (claims) | 98 · 202 30-day fills |
|---|---|
| Patients | 25 |
| Total drug cost | $9,322 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Ohio State University College of Medicine |
|---|---|
| Graduation year | 2020 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pediatric Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Osu General Internal Medicine LLCColumbus, OH · 276 clinicians
- Nationwide Children's HospitalColumbus, OH · 142 clinicians
Hospital affiliations
- Nationwide Children's HospitalColumbus, OH
- Ohio State University State Health SystemColumbus, OH
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 24 internal medicine physicians in Hilliard · All internal medicine physicians in Ohio