Erin L. Greer, M.D.
NPI 1780662437ActiveIndividual· Internal Medicine, Nephrology· Sioux Falls, SD
Opted out of Medicare from January 2025 to January 2027. Internal Medicine, Nephrology (M.D.) in Sioux Falls, South Dakota, licensed in SD and FL, with an NPI issued in January 2006. 511 Medicare patients in 2024, $122,321 paid; nearly all of their 2,577 Part D prescriptions were generic (98%). Corcept Therapeutics reported $58.24 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1780662437 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 4, 2006 |
| Last updated in NPPES | Sep 21, 2020 |
| Certified by provider | Sep 21, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 11992 | SD |
| Internal Medicine, Nephrology | 207RN0300X | ME106873 | FL |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Opt-out | Opted out Jan 1, 2025 – Jan 1, 2027 |
| Can order and refer | Yes |
| Accepts assignment | Yes (participating) |
During an opt-out period the provider sees Medicare patients only under private contracts, and Medicare does not pay claims for their services.
Medicare services in 2024
| Medicare patients | 511 |
|---|---|
| Services billed | 1,580 across 13 procedure codes |
| Paid by Medicare | $122,321 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,577 · 5,083 30-day fills |
|---|---|
| Patients | 318 |
| Total drug cost | $161,671 |
| Generic share | 98% of claims |
Industry payments (Open Payments)
- 2025$58.24 · 1 payment from 1 company
- 2024$31.87 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $58.24 | 1 |
What the 2025 payments were for
- Food and Beverage$58.24 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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