John F. Brennan, MD
NPI 1154351153ActiveIndividual· Internal Medicine, Nephrology· Racine, WI
Internal Medicine, Nephrology (MD) in Racine, Wisconsin, trained at R Franklin University of Med & Sci/Chicago Medical School (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $334,227 for 4,065 claims, against $84,452 paid for services in 2024. Baxter Healthcare was the largest of 3 companies reporting payments in 2024, $230.47 in all, mostly food and beverage.
Overview
| NPI | 1154351153 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 4, 2006 |
| Last updated in NPPES | Mar 24, 2026 |
| Certified by provider | Mar 24, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 37698 | WI |
| Internal Medicine | 207R00000X | 37698 | 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 - Nephrology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 260 |
|---|---|
| Services billed | 777 across 19 procedure codes |
| Paid by Medicare | $84,452 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,065 · 7,841 30-day fills |
|---|---|
| Patients | 396 |
| Total drug cost | $334,227 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | R Franklin University of Med & Sci/Chicago Medical School |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical groups
- Ascension Medical Group-Southeast Wisconsin IncBrookfield, WI · 545 clinicians
- Milwaukee Nephrologists SCGlendale, WI · 21 clinicians
Hospital affiliations
- Ascension All Saints HospitalRacine, WI
- Ascension Se Wisconsin HospitalMilwaukee, WI
- Aurora Medical Center KenoshaKenosha, WI
Other facilities
- Davita Harbor View DialysisDialysis facility · Racine, WI
- Davita Willow Creek DialysisDialysis facility · Racine, WI
- Ascension at HomeHome health agency · Milwaukee, WI
Industry payments (Open Payments)
- 2024$230.47 · 5 payments from 3 companies
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Baxter Healthcare | $135.46 | 1 |
| Ardelyx, Inc. | $47.73 | 2 |
| Akebia Therapeutics Inc | $47.28 | 2 |
What the 2024 payments were for
- Food and Beverage$205.86 · 4 payments
- Education$24.61 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records