Gregory Eric Mumm, M.D.
NPI 1548228810ActiveIndividual· Internal Medicine, Rheumatology· Sioux Falls, SD
Internal Medicine, Rheumatology (M.D.) in Sioux Falls, South Dakota, trained at University of North Dakota School of Medicine (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $3,254,138 for 4,146 claims, against $60,444 paid for services in 2024. Abbvie Inc. was the largest of 6 companies reporting payments in 2025, $291.17 in all, mostly food and beverage.
Overview
| NPI | 1548228810 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 3, 2006 |
| Last updated in NPPES | Oct 31, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | 7481 | SD |
| Internal Medicine | 207R00000X | 48817 | WI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Rheumatology (SD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 533 |
|---|---|
| Services billed | 1,409 across 16 procedure codes |
| Paid by Medicare | $60,444 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,146 · 7,649 30-day fills |
|---|---|
| Patients | 553 |
| Total drug cost | $3,254,138 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | University of North Dakota School of Medicine |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Rheumatology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Avera McKennanSioux Falls, SD · 959 clinicians
Hospital affiliations
- Avera Holy Family HospitalEstherville, IA
- Avera Marshall Regional Medical CtrMarshall, MN
- Avera McKennan Hospital & University Health CenterSioux Falls, SD
- Avera St Mary's HospitalPierre, SD
- Milbank Area Hospital/Avera HealthMilbank, SD
Industry payments (Open Payments)
- 2025$291.17 · 12 payments from 6 companies
- 2024$133.02 · 6 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $107.18 | 4 |
| Amgen Inc. | $85.67 | 4 |
| Pfizer Inc. | $38.80 | 1 |
| Ucb, Inc. | $25.22 | 1 |
| Novartis Pharmaceuticals Corporation | $18.22 | 1 |
What the 2025 payments were for
- Food and Beverage$291.17 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All Internal Medicine, Rheumatology providers in South Dakota →