Daniel C. Brennan, MD
NPI 1023036597ActiveIndividual· Internal Medicine, Nephrology· Baltimore, MD
Internal Medicine, Nephrology (MD) in Baltimore, Maryland, trained at University of Iowa, Rj & L Carver College of Medicine (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $66,141 for 949 claims, against $29,072 paid for services in 2024. Alexion Pharmaceuticals, Inc. was the largest of 5 companies reporting payments in 2025, $16,599 in all, mostly consulting fees.
Overview
| NPI | 1023036597 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 17, 2006 |
| Last updated in NPPES | Jul 21, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | D83543 | MD |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (DC); Practitioner - Nephrology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 146 |
|---|---|
| Services billed | 385 across 15 procedure codes |
| Paid by Medicare | $29,072 |
Part D prescriptions in 2024
| Prescriptions (claims) | 949 · 2,009 30-day fills |
|---|---|
| Patients | 264 |
| Total drug cost | $66,141 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | University of Iowa, Rj & L Carver College of Medicine |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical group
- Johns Hopkins UniversityBaltimore, MD · 2,909 clinicians
Hospital affiliations
- Barnes Jewish HospitalSaint Louis, MO
- Johns Hopkins Hospital, theBaltimore, MD
- Luminis Health Anne Arundel Medical Center, IncAnnapolis, MD
- Wellspan York HospitalYork, PA
Industry payments (Open Payments)
- 2025$16,599 · 7 payments from 5 companies
- 2024$53,882 · 22 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alexion Pharmaceuticals, Inc. | $7,080 | 3 |
| Sanofi-Aventis U.S. LLC | $3,504 | 1 |
| Sanofi US Services Inc. | $3,412 | 1 |
| Takeda Pharmaceuticals U.S.A., Inc. | $2,560 | 1 |
| Calliditas Therapeutics US Inc. | $43.26 | 1 |
What the 2025 payments were for
- Consulting Fee$16,556 · 6 payments
- Food and Beverage$43.26 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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