Quick answers
- Which hospitals does Mark Duncan work at?
- Medicare's official clinician data lists Mark Duncan at 2 hospitals: Johns Hopkins Bayview Medical Center and The Johns Hopkins Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Duncan see patients?
- Medicare's clinician data lists 1 practice location in Baltimore, MD. Call before your visit to confirm the address.
- What is Mark Duncan's specialty?
- Medicare lists General Surgery as the primary specialty.
- Does Mark Duncan accept Medicare assignment?
- Medicare's clinician data says Mark Duncan may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Mark Duncan offer telehealth?
- Medicare's clinician data says Mark Duncan offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark Duncan?
- (410) 550-0100, as listed in official Medicare / NPI Registry data.
- What is Mark Duncan's NPI number?
- 1225079593. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Duncan works
Medicare's Facility Affiliation Data lists Mark Duncan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Johns Hopkins Bayview Medical CenterBaltimore, MD · Acute Care Hospital · CCN 210029
- The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · CCN 210009
Practice locations
Addresses where Mark Duncan is enrolled with Medicare (CMS data updated 2026-10-02).
- 4940 Eastern AveBaltimore, MD 21224 (410) 550‑0100
Group practices
Medicare enrollment lists Mark Duncan as a member of this group (CMS data updated 2026-10-02).
- Johns Hopkins University2,909 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Baltimore
Clinicians with the same Medicare primary specialty in Baltimore, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Mayo Medical School |
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1225079593 |
| 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