DR. KAREN M GREMMINGER (M.D.) – Hematology & Oncology Physician, NPI 1174668404
Hematology & Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
350 HEMATOLOGY/ONCOLOGY in WI
Provider Addresses for DR. KAREN M GREMMINGER (M.D.)
491 S WASHBURN ST
OSHKOSH, WI 549046733
Phone: (920) 292-5555
Type: Location
491 S Washburn St
Oshkosh, WI 549046733
Phone: (920) 292-5555
Type: Location
122 E COLLEGE AVE
APPLETON, WI 549115794
Phone: (920) 996-3264
Fax: (920) 830-5910
Type: Mailing
5880 S HOSPITAL DR
GLOBE, AZ 855019447
Phone: (928) 425-3261
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 33 Open Payments records for all available years, with a total value of $782.
Total Amount is formed as General ($782) + Research ($0) + Ownership ($0) = $782.
Last reported payment date: 2024-09-26 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($173).
Total Amount
$782
General + Research + Ownership
Payments
33
Total payment records
General Amount
$782
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-09-26
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca Pharmaceuticals LP | $173 |
| Novartis Pharmaceuticals Corporation | $136 |
| Seagen Inc. | $100 |
| Aveo Pharmaceuticals, Inc. | $85 |
| SOBI, INC | $69 |
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: 2021-10-12
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 |
|---|---|---|---|---|
| I20210909003593 | I | Medical Oncology | AZ | TBD |
| I20211012002914 | I | Hematology/Oncology | TX | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 331 | 95 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 109 | 63 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 42 | 29 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 34 | 34 | $0 |
| 99205 | New patient office or other outpatient visit, 60-74 minutes | 31 | 31 | $0 |
Insurance plans in this area (ZIP 54904)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | CA | |
| Emergency Medicine | CA | |
| Neurology, Ophthalmology | AZ | |
| Diagnostic Radiology | MN | |
| Osteopathic Manipulative Medicine, Family Practice | AZ | |
| - | AZ | |
| - | CO | |
| Emergency Medicine | CA | |
| Family Practice | PR | |
| Orthopedic Surgery | AZ |
Reviews
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