Quick answers
- Which hospitals does Peter C. Gregg work at?
- Medicare's official clinician data lists Peter C. Gregg at 2 hospitals: Mercy Medical Center Inc and The Johns Hopkins Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Peter C. Gregg see patients?
- Medicare's clinician data lists 3 practice locations, including Baltimore, MD and Hunt Valley, MD. Call before your visit to confirm the address.
- What is Peter C. Gregg's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Peter C. Gregg accept Medicare assignment?
- Yes. Medicare's clinician data says Peter C. Gregg 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 Peter C. Gregg?
- (410) 327-5100, as listed in official Medicare / NPI Registry data.
- What is Peter C. Gregg's NPI number?
- 1558564294. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Peter C. Gregg works
Medicare's Facility Affiliation Data lists Peter C. Gregg at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Medical Center IncBaltimore, MD · Acute Care Hospital · CCN 210008
- The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · CCN 210009
Practice locations
Addresses where Peter C. Gregg is enrolled with Medicare (CMS data updated 2026-10-02).
- 1235 E Monument St, Jai Medical CenterBaltimore, MD 21202 (410) 327‑5100
- 301 International CirHunt Valley, MD 21030 (410) 433‑2200
- 5010 York RdBaltimore, MD 21212 (410) 433‑2200
Group practices
Medicare enrollment lists Peter C. Gregg as a member of this group (CMS data updated 2026-10-02).
- Hollis Seunarine Mdpa LLC19 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Baltimore
Clinicians with the same Medicare primary specialty in Baltimore, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Johns Hopkins University School Of Medicine |
| Graduation year | 2007 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558564294 |
| 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