Maria Isabel Villegas Kastner, M.D.
NPI 1154859429ActiveIndividual· Internal Medicine, Nephrology· Baltimore, MD
Internal Medicine, Nephrology (M.D.) with University of North Carolina at Chapel Hill and 1 other group, practicing in Baltimore, Maryland. Their prescriptions cost Medicare Part D more than their services did: $139,320 for 1,230 claims, against $87,985 paid for services in 2024. Otsuka America Pharmaceutical, Inc. was the largest of 12 companies reporting payments in 2025, $580.42 in all, mostly food and beverage. Lists Chatham Hospital Inc and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1154859429 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 31, 2017 |
| Last updated in NPPES | Nov 16, 2022 |
| Certified by provider | Oct 25, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 2022-02410 | NC |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 (NC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 163 |
|---|---|
| Services billed | 6,761 across 32 procedure codes |
| Paid by Medicare | $87,985 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,230 · 2,493 30-day fills |
|---|---|
| Patients | 224 |
| Total drug cost | $139,320 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Nephrology |
Medical groups
- University of North Carolina at Chapel HillChapel Hill, NC · 2,052 clinicians
- Unc Physicians Network LLCKinston, NC · 998 clinicians
Hospital affiliations
- Chatham Hospital IncSiler City, NC
- Rex HospitalRaleigh, NC
- Unc HospitalsChapel Hill, NC
Other facilities
- Fmc Carolina Dialysis Lee CountyDialysis facility · Sanford, NC
- Unc Hospitals Inpatient RehabInpatient rehabilitation facility · Chapel Hill, NC
Industry payments (Open Payments)
- 2025$580.42 · 28 payments from 12 companies
- 2024$394.30 · 11 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Otsuka America Pharmaceutical, Inc. | $110.40 | 4 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $69.75 | 4 |
| Calliditas Therapeutics US Inc. | $66.58 | 2 |
| Novartis Pharmaceuticals Corporation | $64.34 | 3 |
| Amgen Inc. | $60.40 | 3 |
What the 2025 payments were for
- Food and Beverage$580.42 · 28 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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