Mary Margaret Keller, APNP
NPI 1992727259ActiveIndividual· Nurse Practitioner· Milwaukee, WI
Nurse Practitioner (APNP) with Milwaukee Nephrologists SC, practicing in Milwaukee, Wisconsin. Medicare paid $14,420 for services to 79 patients in 2024. Ani Pharmaceuticals, Inc. was the largest of 16 companies reporting payments in 2025, $841.99 in all, mostly food and beverage. Lists Aurora St Lukes Medical Center as a hospital affiliation.
Overview
| NPI | 1992727259 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | APNP |
| Sole proprietor | No |
| NPI issued | Jul 24, 2006 |
| Last updated in NPPES | Dec 9, 2019 |
| Certified by provider | Dec 9, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 1968 | WI |
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 - Nurse Practitioner (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 79 |
|---|---|
| Services billed | 306 across 5 procedure codes |
| Paid by Medicare | $14,420 |
Education and affiliations
| Graduation year | 1986 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Milwaukee Nephrologists SCGlendale, WI · 21 clinicians
Hospital affiliation
- Aurora St Lukes Medical CenterMilwaukee, WI
Industry payments (Open Payments)
- 2025$841.99 · 38 payments from 16 companies
- 2024$1,706 · 73 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ani Pharmaceuticals, Inc. | $177.62 | 6 |
| Novartis Pharmaceuticals Corporation | $131.14 | 6 |
| Calliditas Therapeutics US Inc. | $87.73 | 4 |
| Otsuka America Pharmaceutical, Inc. | $61.26 | 3 |
| Amgen Inc. | $57.21 | 3 |
What the 2025 payments were for
- Food and Beverage$820.02 · 37 payments
- Education$21.97 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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