Mark Blackwelder, M.D.
NPI 1245200880ActiveIndividual· Internal Medicine· Ruston, LA
Internal Medicine (M.D.) in Ruston, Louisiana, trained at Louisiana State University School of Medicine in Shreveport (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $960,686 for 8,078 claims, against $189,539 paid for services in 2024. Corcept Therapeutics was the largest of 14 companies reporting payments in 2025, $548.16 in all, mostly food and beverage.
Overview
| NPI | 1245200880 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 25, 2006 |
| Last updated in NPPES | Oct 15, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 18456 | LA |
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 (LA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 382 |
|---|---|
| Services billed | 5,075 across 43 procedure codes |
| Paid by Medicare | $189,539 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,078 · 13,810 30-day fills |
|---|---|
| Patients | 382 |
| Total drug cost | $960,686 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | Louisiana State University School of Medicine in Shreveport |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Internal Medicine |
Medical group
- Green Clinic LLCRuston, LA · 27 clinicians
Hospital affiliations
- Northern Louisiana Medical CenterRuston, LA
- Union General HospitalFarmerville, LA
Other facilities
- Best Home HealthHome health agency · West Monroe, LA
- Lagniappe Homecare Northern LouisianaHome health agency · Ruston, LA
- Magnolia Home Health Care, IncHome health agency · Arcadia, LA
- Primestar Home Health of Nwla, IncHome health agency · Minden, LA
Industry payments (Open Payments)
- 2025$548.16 · 24 payments from 14 companies
- 2024$417.99 · 23 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $152.75 | 6 |
| Abbvie Inc. | $76.33 | 3 |
| Novo Nordisk Inc | $59.03 | 3 |
| Lilly USA, LLC | $45.00 | 1 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $31.94 | 2 |
What the 2025 payments were for
- Food and Beverage$503.16 · 23 payments
- Education$45.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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