Quick answers
- Which hospitals does Eric Grenier work at?
- Medicare's official clinician data lists Eric Grenier at 1 hospital: Holy Cross Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Eric Grenier see patients?
- Medicare's clinician data lists 2 practice locations, including Kensington, MD and Largo, MD. Call before your visit to confirm the address.
- What is Eric Grenier's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Eric Grenier accept Medicare assignment?
- Yes. Medicare's clinician data says Eric Grenier 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 Eric Grenier?
- (301) 929-7100, as listed in official Medicare / NPI Registry data.
- What is Eric Grenier's NPI number?
- 1649595109. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Eric Grenier works
Medicare's Facility Affiliation Data lists Eric Grenier at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Holy Cross HospitalSilver Spring, MD · Acute Care Hospital · CCN 210004
Practice locations
Addresses where Eric Grenier is enrolled with Medicare (CMS data updated 2026-10-02).
- 10810 Connecticut AveKensington, MD 20895 (301) 929‑7100
- 1221 Mercantile LnLargo, MD 20774 (301) 618‑5700
Group practices
Medicare enrollment lists Eric Grenier as a member of this group (CMS data updated 2026-10-02).
- Kaiser Foundation Health Plan of the Mid Atlantic States, Inc1,899 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Kensington
Clinicians with the same Medicare primary specialty in Kensington, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Uniformed Services Uhs Fe Hebert School Of Med |
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649595109 |
| 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