Margaret Riesenberg-Karges, MD
NPI 1235371725ActiveIndividual· Surgery· Tucson, AZ
Surgery (MD) in Tucson, Arizona, trained at Saint Louis University School of Medicine (class of 2009). 174 Medicare patients in 2024, $79,017 paid; nearly all of their 201 Part D prescriptions were generic (99%). Intuitive Surgical, Inc. reported $16.86 in payments in 2024, mostly food and beverage.
Overview
| NPI | 1235371725 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 30, 2009 |
| Last updated in NPPES | Mar 5, 2025 |
| Certified by provider | Mar 5, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 52314 | AZ |
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 (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 174 |
|---|---|
| Services billed | 429 across 54 procedure codes |
| Paid by Medicare | $79,017 |
Part D prescriptions in 2024
| Prescriptions (claims) | 201 · 231 30-day fills |
|---|---|
| Patients | 127 |
| Total drug cost | $1,028 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Saint Louis University School of Medicine |
|---|---|
| Graduation year | 2009 |
| Medicare specialty | General Surgery |
Hospital affiliations
- Northwest Medical CenterTucson, AZ
- Oro Valley HospitalOro Valley, AZ
Other facilities
- Bayada HospiceHospice · Tucson, AZ
Industry payments (Open Payments)
- 2024$16.86 · 1 payment from 1 company
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Intuitive Surgical, Inc. | $16.86 | 1 |
What the 2024 payments were for
- Food and Beverage$16.86 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 205 general surgeons in Tucson · All general surgeons in Arizona