Quick answers
- Which hospitals does Mark E. Chisam work at?
- Medicare's official clinician data lists Mark E. Chisam at 1 hospital: Riverside Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark E. Chisam see patients?
- Medicare's clinician data lists 2 practice locations, including Williamsburg, VA and Gloucester, VA. Call before your visit to confirm the address.
- What is Mark E. Chisam's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does Mark E. Chisam accept Medicare assignment?
- Yes. Medicare's clinician data says Mark E. Chisam 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 Mark E. Chisam?
- (757) 220-4900, as listed in official Medicare / NPI Registry data.
- What is Mark E. Chisam's NPI number?
- 1053381251. 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 E. Chisam works
Medicare's Facility Affiliation Data lists Mark E. Chisam at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Riverside Regional Medical CenterNewport News, VA · Acute Care Hospital · CCN 490052
Practice locations
Addresses where Mark E. Chisam is enrolled with Medicare (CMS data updated 2026-10-02).
- 3901 Treyburn Dr, Suite BWilliamsburg, VA 23185 (757) 220‑4900
- 7544 Medical DrGloucester, VA 23061 (804) 693‑4900
Group practices
Medicare enrollment lists Mark E. Chisam as a member of this group (CMS data updated 2026-10-02).
- Riverside Physician Services Inc797 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Virginia
Clinicians with the same Medicare primary specialty in Virginia — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Uniformed Services Uhs Fe Hebert School Of Med |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1053381251 |
| 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