Mark Sitarik, MD
Medical Oncologist / Hematologist
Not accepting new patients at this time
Announcements
Dr. Sitarik retired on June 30, 2025 after 38 years of practice. He is no longer accepting new patients.
Provider Biography
Dr. Mark Sitarik is a board-certified medical oncologist. As a founding member of the Boulder Rocky Mountain Cancer Centers office, Dr. Sitarik is well-known in the Boulder area for his expertise. His practice emphasis includes breast cancer, colorectal cancer, lung cancer, urological cancers, and blood cancers including leukemia, lymphoma, and multiple myeloma. Dr. Sitarik has built a strong connection with other cancer specialists such as surgeons, radiation oncologists, pathologists, and radiologists. His participation in multiple weekly tumor boards with these other specialists is critical to his patients’ care. Through sharing their expertise and reviewing cancer cases, these experts will determine the most ideal cancer treatment strategy for the patient. Dr. Sitarik’s partnership with US Oncology provides him immediate access to the most cutting-edge therapies and current clinical research trials. The hallmark of his practice is to provide his patients the best care available.
Provider Specialties
- Blood Cancers
- Breast Cancer
- Gastrointestinal Cancers
- Lung Cancer
- Urologic Cancers
Introduction Video
Care Philosophy
I have had the privilege of serving the citizens of Boulder in my private practice of medical oncology since 1987. My objective is to assess the medical, emotional, and life journey goals of my patients and mesh those goals into a state-of-the-art, evidence-based treatment plan that best serves the needs of that individual. I strive to give an honest assessment of any given clinical situation. Only through that honest assessment and open discussion can a patient make the best treatment decision in any given set of circumstances.
Care Team
Holly Saracco
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Locations
Reviews
Education
Fellowship
Medical Oncology, University of Colorado Health Sciences Center, Denver, CO
Residency
Internal Medicine, University Hospitals of Cleveland, Cleveland, OH
Medical School
Hahnemann Medical College and Hospital, Philadelphia, PA
Board Certifications
Medical Oncology
Memberships
American Society of Clinical Oncology
Videos
Our providers accept all of the following insurances:
- Aetna
- Anthem BCBS Colorado
- Apostrophe Health
- b SMART
- Carrum
- Cigna
- Colorado Access
- First Health
- Humana Medicare Advantage
- *Kaiser (depending on market)
- Medicare
- Medicaid
- Multiplan/PHCS
- Optum Health / Optum Care CO
- PHPprime
- Rocky Mountain Health Plans Medicaid Prime, CHP+, Valley, Monument Tier 2 & CO Doctors Plan
- SMS
- TRICARE/HealthNET
- United Healthcare