DR. RUTH CALLAWAY WARREN (DO) – Medical Oncology Physician, NPI 1124096185
Medical Oncology Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
121 MEDICAL ONCOLOGY in WI
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Provider Addresses for DR. RUTH CALLAWAY WARREN (DO)
Saint Mary's Hospital Medical Center, 1726, Shawano Avenue, Green Bay, Brown County, Wisconsin, 54303, United States
GREEN BAY, WI 543033216
Phone: (920) 884-3135
Fax: (920) 884-3144
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $55.
Total Amount is formed as General ($55) + Research ($0) + Ownership ($0) = $55.
Last reported payment date: 2023-07-20 • Largest payer in this snapshot: Merck Sharp & Dohme LLC ($40).
Total Amount
$55
General + Research + Ownership
Payments
3
Total payment records
General Amount
$55
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-07-20
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Merck Sharp & Dohme LLC | $40 |
| Amgen Inc. | $15 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2009-11-24
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20091027000116 | I | Medical Oncology | MI | TBD |
| I20091124000158 | I | Medical Oncology | WI | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 90 | 61 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 70 | 35 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 49 | 38 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 14 | 14 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 13 | 13 | $0 |
Insurance plans in this area (ZIP 54303)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Infectious Disease, Internal Medicine, Infectious Disease | AK | |
| - | WI | |
| Hematology/Oncology, Internal Medicine | WI | |
| - | WI | |
| - | WI | |
| Internal Medicine, Infectious Disease, Internal Medicine | NY | |
| Nurse Practitioner | WI | |
| H E M A T O L O G Y/ O N C O L O G Y | WI | |
| - | WI | |
| - | WI |
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