Marc E. Chapman, M.D.
NPI 1679578777ActiveIndividual· Internal Medicine· Euless, TX
Internal Medicine (M.D.) in Euless, Texas, trained at University of Oklahoma College of Medicine (class of 1989). Their prescriptions cost Medicare Part D more than their services did: $860,640 for 12,765 claims, against $88,504 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 15 companies reporting payments in 2025, $627.19 in all, mostly food and beverage.
Overview
| NPI | 1679578777 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 15, 2005 |
| Last updated in NPPES | Mar 11, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | L1000 | TX |
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 (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 301 |
|---|---|
| Services billed | 1,849 across 67 procedure codes |
| Paid by Medicare | $88,504 |
Part D prescriptions in 2024
| Prescriptions (claims) | 12,765 · 28,537 30-day fills |
|---|---|
| Patients | 740 |
| Total drug cost | $860,640 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of Oklahoma College of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Catalyst Physician Group - Ntx, PLLCMansfield, TX · 86 clinicians
Hospital affiliations
- Baylor Scott & White Medical Center GrapevineGrapevine, TX
- Lake Granbury Medical CenterGranbury, TX
- Medical City AllianceFort Worth, TX
- Texas Health Harris Methodist Hurst-Euless-BedfordBedford, TX
Other facilities
- Encompass Home Health of DfwHome health agency · Grapevine, TX
Industry payments (Open Payments)
- 2025$627.19 · 33 payments from 15 companies
- 2024$422.08 · 20 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $121.76 | 6 |
| Amgen Inc. | $96.73 | 5 |
| Lilly USA, LLC | $61.49 | 3 |
| Novo Nordisk Inc | $51.41 | 3 |
| Abbott Laboratories | $47.88 | 2 |
What the 2025 payments were for
- Food and Beverage$627.19 · 33 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 24 internal medicine physicians in Euless · All internal medicine physicians in Texas