Mark Knapp, MD
NPI 1952359549ActiveIndividual· Internal Medicine, Hematology & Oncology· Columbus, OH
Internal Medicine, Hematology & Oncology (MD) in Columbus, Ohio, trained at University of Cincinnati College of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $6,526,759 for 882 claims, against $1,206,555 paid for services in 2024. Gilead Sciences, Inc. was the largest of 17 companies reporting payments in 2025, $8,370 in all, mostly consulting fees.
Overview
| NPI | 1952359549 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 5, 2006 |
| Last updated in NPPES | Jan 11, 2023 |
| Certified by provider | Jan 11, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 35078040 | OH |
| Internal Medicine, Medical Oncology | 207RX0202X | 35078040 | 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 - Hematology/Oncology (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 412 |
|---|---|
| Services billed | 59,176 across 92 procedure codes |
| Paid by Medicare | $1,206,555 |
Part D prescriptions in 2024
| Prescriptions (claims) | 882 · 1,162 30-day fills |
|---|---|
| Patients | 162 |
| Total drug cost | $6,526,759 |
| Generic share | 56% of claims |
Education and affiliations
| Medical school | University of Cincinnati College of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Medical Oncology |
| Telehealth | Offers telehealth |
Medical group
- American Oncology Partners PAFort Wayne, IN · 391 clinicians
Hospital affiliations
- Mount Carmel East & WestColumbus, OH
- Mount Carmel St Ann'sWesterville, OH
Industry payments (Open Payments)
- 2025$8,370 · 39 payments from 17 companies
- 2024$15,136 · 30 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $5,796 | 12 |
| Caris Mpi, Inc. | $1,044 | 2 |
| Avyxa Pharma, LLC | $1,000 | 1 |
| Aveo Pharmaceuticals, Inc. | $78.34 | 3 |
| Eisai Inc. | $77.68 | 3 |
What the 2025 payments were for
- Consulting Fee$5,370 · 2 payments
- Food and Beverage$1,030 · 32 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$1,000 · 1 payment
- Travel and Lodging$970.02 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 61 hematologist-oncologists in Columbus · All hematologist-oncologists in Ohio