Quick answers
- Which hospitals does Mark L. Greaves work at?
- Medicare's official clinician data lists Mark L. Greaves at 2 hospitals: Morristown Medical Center and Robert Wood Johnson University Hospital - Somerset…. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark L. Greaves see patients?
- Medicare's clinician data lists 1 practice location in Hillsborough, NJ. Call before your visit to confirm the address.
- What is Mark L. Greaves's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Mark L. Greaves accept Medicare assignment?
- Yes. Medicare's clinician data says Mark L. Greaves 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.
- Does Mark L. Greaves offer telehealth?
- Medicare's clinician data says Mark L. Greaves offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark L. Greaves?
- (908) 218-9222, as listed in official Medicare / NPI Registry data.
- What is Mark L. Greaves's NPI number?
- 1518139914. 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 L. Greaves works
Medicare's Facility Affiliation Data lists Mark L. Greaves at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Morristown Medical CenterMorristown, NJ · Acute Care Hospital · CCN 310015
- Robert Wood Johnson University Hospital - Somerset…Somerville, NJ · Acute Care Hospital · CCN 310048
Practice locations
Addresses where Mark L. Greaves is enrolled with Medicare (CMS data updated 2026-10-02).
- 511 Courtyard DrHillsborough, NJ 08844 (908) 218‑9222
Group practices
Medicare enrollment lists Mark L. Greaves as a member of this group (CMS data updated 2026-10-02).
- Digestive Healthcare Center PA13 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Hillsborough
Clinicians with the same Medicare primary specialty in Hillsborough, NJ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University |
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1518139914 |
| 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