Mark Gene Lounsbery, D.O
NPI 1568654648ActiveIndividual· Internal Medicine· Sioux Falls, SD
Internal Medicine (D.O) with Sanford Medical Center, practicing in Sioux Falls, South Dakota. Their prescriptions cost Medicare Part D more than their services did: $742,034 for 10,810 claims, against $89,269 paid for services in 2024. Amgen Inc. reported $69.29 in payments in 2025, mostly food and beverage. Lists Douglas County Memorial Hospital-Cah and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1568654648 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O |
| Sole proprietor | No |
| NPI issued | Aug 13, 2007 |
| Last updated in NPPES | Apr 6, 2022 |
| Certified by provider | Apr 6, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 7272 | SD |
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 (SD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,230 |
|---|---|
| Services billed | 3,177 across 17 procedure codes |
| Paid by Medicare | $89,269 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,810 · 23,742 30-day fills |
|---|---|
| Patients | 744 |
| Total drug cost | $742,034 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 2005 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Sanford Medical CenterSioux Falls, SD · 857 clinicians
Hospital affiliations
- Douglas County Memorial Hospital-CahArmour, SD
- Murray County Memorial HospitalSlayton, MN
- Sanford Luverne Medical CenterLuverne, MN
- Sanford Tracy Medical CenterTracy, MN
- Sanford Usd Medical CenterSioux Falls, SD
Other facilities
- Aveanna Home HealthHome health agency · Sioux Falls, SD
- Avera @ HomeHome health agency · Sioux Falls, SD
- Sanford Home HealthHome health agency · Sioux Falls, SD
- Sanford HospiceHospice · Sioux Falls, SD
- Good Samaritan Society Sioux Falls VillageNursing home · Sioux Falls, SD
Industry payments (Open Payments)
- 2025$69.29 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $69.29 | 3 |
What the 2025 payments were for
- Food and Beverage$69.29 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 124 internal medicine physicians in Sioux Falls · All internal medicine physicians in South Dakota