Gregory Mark Gerrish, M.D.
NPI 1992097703ActiveIndividual· Surgery· Watertown, SD
Surgery (M.D.) in Watertown, South Dakota, trained at Sanford School of Medicine of University of South Dakota (class of 2011). 296 Medicare patients in 2024, $91,466 paid; nearly all of their 482 Part D prescriptions were generic (93%). Organogenesis Inc. was the largest of 6 companies reporting payments in 2025, $268.19 in all, mostly food and beverage.
Overview
| NPI | 1992097703 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 12, 2011 |
| Last updated in NPPES | Aug 17, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 10080 | SD |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - General Surgery (MN); Practitioner - General Surgery (SD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 296 |
|---|---|
| Services billed | 644 across 82 procedure codes |
| Paid by Medicare | $91,466 |
Part D prescriptions in 2024
| Prescriptions (claims) | 482 · 681 30-day fills |
|---|---|
| Patients | 312 |
| Total drug cost | $9,544 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | Sanford School of Medicine of University of South Dakota |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | General Surgery |
Medical group
- Prairie Lakes Health Care System IncWatertown, SD · 109 clinicians
Hospital affiliations
- Ortonville Area Health ServicesOrtonville, MN
- Prairie Lakes Healthcare System, IncWatertown, SD
Industry payments (Open Payments)
- 2025$268.19 · 9 payments from 6 companies
- 2024$61.23 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Organogenesis Inc. | $150.67 | 4 |
| Tela Bio, Inc. | $39.98 | 1 |
| Solventum Corporation | $25.20 | 1 |
| Molnlycke Health Care US, LLC | $19.75 | 1 |
| Ethicon US, LLC | $19.55 | 1 |
What the 2025 payments were for
- Food and Beverage$268.19 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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