Ruth Callaway Warren, DO
NPI 1124096185ActiveIndividual· Internal Medicine, Medical Oncology· Green Bay, WI
Internal Medicine, Medical Oncology (DO) in Green Bay, Wisconsin, licensed in WI and MI, with an NPI issued in March 2006. Their prescriptions cost Medicare Part D more than their services did: $1,075,672 for 608 claims, against $36,024 paid for services in 2024. Sk Life Science, Inc. was the largest of 4 companies reporting payments in 2025, $112.14 in all, mostly food and beverage.
Overview
| NPI | 1124096185 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Mar 8, 2006 |
| Last updated in NPPES | Dec 20, 2021 |
| Certified by provider | Dec 20, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 50362 | WI |
| Internal Medicine, Medical Oncology | 207RX0202X | 5101018539 | MI |
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 - Medical Oncology (MI); Practitioner - Medical Oncology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 216 |
|---|---|
| Services billed | 376 across 8 procedure codes |
| Paid by Medicare | $36,024 |
Part D prescriptions in 2024
| Prescriptions (claims) | 608 · 898 30-day fills |
|---|---|
| Patients | 229 |
| Total drug cost | $1,075,672 |
| Generic share | 74% of claims |
Industry payments (Open Payments)
- 2025$112.14 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sk Life Science, Inc. | $39.21 | 1 |
| Ucb, Inc. | $28.33 | 1 |
| Catalyst Pharmaceuticals, Inc. | $27.21 | 1 |
| Actelion Pharmaceuticals US, Inc. | $17.39 | 1 |
What the 2025 payments were for
- Food and Beverage$112.14 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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