Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark Ewing Chisam, MD

Individual provider Radiation Oncology Physician · NPI 1053381251

Dr. Mark Ewing Chisam, MD is a Radiation Oncology in Williamsburg, Virginia. Graduated from Uniformed Services Uhs Fe Hebert School of Med in 1994, 32 years ago. Practices with Riverside Physician Services Inc, a 793-clinician group and accepts Medicare assignment. Licensed in Virginia.

Years since qualifying
32
Trained at
Uniformed Services Uhs Fe Hebert School of Med
Licensed in
VA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

3901 Treyburn Dr Ste B
Williamsburg, VA 23185-2891
Phone: (757) 220-4900
Fax: (757) 565-5328
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 0101054200 (VA)

Record details

NPI number1053381251
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 23, 2006
Last updated in NPPESOctober 3, 2013
Mailing address856 J Clyde Morris Blvd, Suite A, Newport News, VA 23601-1318

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIFORMED SERVICES UHS FE HEBERT SCHOOL OF MED
Graduated 1994 (32 years in practice)
Group practice Riverside Physician Services Inc — 793 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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