Marissa Naomi Karpoff, M.D.
NPI 1659613347ActiveIndividual· Internal Medicine, Rheumatology· Wynnewood, PA
Internal Medicine, Rheumatology (M.D.) in Wynnewood, Pennsylvania, trained at Tulane University School of Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $2,350,412 for 2,174 claims, against $37,222 paid for services in 2024. Glaxosmithkline, LLC. reported $13.91 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1659613347 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 20, 2013 |
| Last updated in NPPES | Apr 15, 2026 |
| Certified by provider | Apr 15, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | MD464904 | PA |
| Internal Medicine, Rheumatology | 207RR0500X | 25MA10574700 | NJ |
| Internal Medicine | 207R00000X | 277829 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Rheumatology (NJ); Practitioner - Rheumatology (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 217 |
|---|---|
| Services billed | 5,694 across 19 procedure codes |
| Paid by Medicare | $37,222 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,174 · 3,294 30-day fills |
|---|---|
| Patients | 392 |
| Total drug cost | $2,350,412 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Tulane University School of Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Rheumatology |
| Telehealth | Offers telehealth |
Medical groups
- Cmc Department of Medicine Group PACamden, NJ · 478 clinicians
- Bryn Mawr Medical Specialists AssociationBryn Mawr, PA · 134 clinicians
Hospital affiliations
- Bryn Mawr HospitalBryn Mawr, PA
- Cooper University HospitalCamden, NJ
- Hospital of Univ of PennsylvaniaPhiladelphia, PA
- Main Line Hospital LankenauWynnewood, PA
- Riddle Memorial HospitalMedia, PA
Industry payments (Open Payments)
- 2025$13.91 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $13.91 | 1 |
What the 2025 payments were for
- Food and Beverage$13.91 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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