Michael Nmn Grassia, MD
NPI 1235128133ActiveIndividual· Internal Medicine, Nephrology· Norfolk, VA
Internal Medicine, Nephrology (MD) in Norfolk, Virginia, trained at Eastern Virginia Medical School (class of 1997). In 2024 Medicare paid $168,511 for 512 patients, and Part D covered 631 of their prescriptions, 87% of them generic. Calliditas Therapeutics US Inc. was the largest of 4 companies reporting payments in 2025, $105.79 in all, mostly food and beverage.
Overview
| NPI | 1235128133 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 14, 2005 |
| Last updated in NPPES | Oct 25, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 0101232951 | VA |
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 (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 512 |
|---|---|
| Services billed | 1,818 across 21 procedure codes |
| Paid by Medicare | $168,511 |
Part D prescriptions in 2024
| Prescriptions (claims) | 631 · 1,281 30-day fills |
|---|---|
| Patients | 113 |
| Total drug cost | $56,883 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Eastern Virginia Medical School |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical group
- Nephrology Associates of Tidewater LtdSuffolk, VA · 24 clinicians
Hospital affiliations
- Chesapeake General HospitalChesapeake, VA
- Riverside Shore Memorial HospitalOnancock, VA
- Sentara Leigh HospitalNorfolk, VA
- Sentara Princess Anne HospitalVirginia Beach, VA
- Sentara Virginia Beach General HospitalVirginia Beach, VA
Other facilities
- Fmc - Virginia BeachDialysis facility · Virginia Beach, VA
Industry payments (Open Payments)
- 2025$105.79 · 19 payments from 4 companies
- 2024$348.38 · 8 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calliditas Therapeutics US Inc. | $36.53 | 1 |
| Travere Therapeutics, Inc. | $35.92 | 16 |
| Otsuka America Pharmaceutical, Inc. | $19.79 | 1 |
| Astrazeneca Pharmaceuticals LP | $13.55 | 1 |
What the 2025 payments were for
- Food and Beverage$69.87 · 3 payments
- Education$35.92 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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