Quick answers
- Which hospitals does Michael Grassia work at?
- Medicare's official clinician data lists Michael Grassia at 5 hospitals: Chesapeake General Hospital, Riverside Shore Memorial Hospital, Sentara Leigh Hospital, Sentara Princess Anne Hospital and Sentara Virginia Beach General Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael Grassia see patients?
- Medicare's clinician data lists 1 practice location in Norfolk, VA. Call before your visit to confirm the address.
- What is Michael Grassia's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Michael Grassia accept Medicare assignment?
- Yes. Medicare's clinician data says Michael Grassia accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Michael Grassia?
- (757) 627-7301, as listed in official Medicare / NPI Registry data.
- What is Michael Grassia's NPI number?
- 1235128133. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael Grassia works
Medicare's Facility Affiliation Data lists Michael Grassia at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Chesapeake General HospitalChesapeake, VA · Acute Care Hospital · CCN 490120
- Riverside Shore Memorial HospitalOnancock, VA · Acute Care Hospital · CCN 490037
- Sentara Leigh HospitalNorfolk, VA · Acute Care Hospital · CCN 490046
- Sentara Princess Anne HospitalVirginia Beach, VA · Acute Care Hospital · CCN 490119
- Sentara Virginia Beach General HospitalVirginia Beach, VA · Acute Care Hospital · CCN 490057
Practice locations
Addresses where Michael Grassia is enrolled with Medicare (CMS data updated 2026-10-02).
- 301 Riverview Ave, Suite 600Norfolk, VA 23510 (757) 627‑7301
Group practices
Medicare enrollment lists Michael Grassia as a member of this group (CMS data updated 2026-10-02).
- Nephrology Associates of Tidewater Ltd24 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Norfolk
Clinicians with the same Medicare primary specialty in Norfolk, VA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Eastern Virginia Medical School |
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235128133 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians