James J. Greenberg, M.D.
NPI 1164412136ActiveIndividual· Surgery· Lake Geneva, WI
Surgery (M.D.) in Lake Geneva, Wisconsin, trained at University of Missouri, Kansas City, School of Medicine (class of 1991). 31 Medicare patients in 2024, $7,966 paid; nearly all of their 426 Part D prescriptions were generic (93%). Aimmune Therapeutics, Inc. reported $26.71 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1164412136 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 21, 2005 |
| Last updated in NPPES | Sep 29, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 53948 | WI |
| Surgery | 208600000X | 036-087181 | IL |
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 - General Surgery (IL); Practitioner - General Surgery (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 31 |
|---|---|
| Services billed | 71 across 16 procedure codes |
| Paid by Medicare | $7,966 |
Part D prescriptions in 2024
| Prescriptions (claims) | 426 · 572 30-day fills |
|---|---|
| Patients | 188 |
| Total drug cost | $5,738 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | University of Missouri, Kansas City, School of Medicine |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | General Surgery |
Medical group
- Mercy Health System CorporationJanesville, WI · 753 clinicians
Hospital affiliations
- Mercy Harvard HospitalHarvard, IL
- Mercy Health System CorpJanesville, WI
- Mercy Walworth Hospital & Medical CenterLake Geneva, WI
Industry payments (Open Payments)
- 2025$26.71 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Aimmune Therapeutics, Inc. | $26.71 | 1 |
What the 2025 payments were for
- Food and Beverage$26.71 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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