What insurance plans does Charles Leonard, MD accept?

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

<span data-sheets-value="{"1":2,"2":"Dr. Leonard is a board-certified radiation oncologist who has been practicing at Rocky Mountain Cancer Centers for over 25 years. He treats a wide variety of cancers, with a special interest in breast cancers and prostate cancer. His areas of expertise include targeted radiation therapy, stereotactic radiosurgery (SRS), stereotactic body radiation therapy (SBRT), intensity-modulated radiation therapy (IMRT), image guided radiotherapy (IGRT), 3-D conformal radiation therapy, and accelerated partial breast irradiation (ABPI). \r\n\r\nDr. Leonard treats each patient the way he would want to be treated himself. He learns about each patient’s unique situation, listens to their needs, explores all options, and strives to do the right thing for them, physically, emotionally, and socially. \r\n\r\nDr. Leonard participates in many tumor boards, where he collaborates with other cancer specialists including surgeons, radiologists, pathologists, and medical oncologists. This allows him to provide a comprehensive, multi-disciplinary approach to his cancer treatment recommendations. Along with his radiation oncology partners, Dr. Leonard was instrumental in the development of accelerated partial breast irradiation, maintaining one of the largest databases in the world for intensity modulated accelerated partial breast irradiation, in which small breast tumors can be treated over just one week. \r\n\r\nDr. Leonard has served as principal investigator for many clinical trial studies and emphasizes the importance of participating in clinical research trials when appropriate to ensure his patients are receiving the most up-to-date, cutting edge treatment for their disease. \r"}" data-sheets-userformat="{"2":771,"3":{"1":0},"4":{"1":2,"2":16573901},"11":4,"12":0}">Dr. Leonard is a board-certified radiation oncologist who has been practicing at Rocky Mountain Cancer Centers for over 25 years. He treats a wide variety of cancers, with a special interest in breast cancers and prostate cancer. His areas of expertise include targeted radiation therapy, stereotactic radiosurgery (SRS), stereotactic body radiation therapy (SBRT), intensity-modulated radiation therapy (IMRT), image guided radiotherapy (IGRT), 3-D conformal radiation therapy, and accelerated partial breast irradiation (ABPI). Dr. Leonard treats each patient the way he would want to be treated himself. He learns about each patient’s unique situation, listens to their needs, explores all options, and strives to do the right thing for them, physically, emotionally, and socially. Dr. Leonard participates in many tumor boards, where he collaborates with other cancer specialists including surgeons, radiologists, pathologists, and medical oncologists. This allows him to provide a comprehensive, multi-disciplinary approach to his cancer treatment recommendations. Along with his radiation oncology partners, Dr. Leonard was instrumental in the development of accelerated partial breast irradiation, maintaining one of the largest databases in the world for intensity modulated accelerated partial breast irradiation, in which small breast tumors can be treated over just one week. Dr. Leonard has served as principal investigator for many clinical trial studies and emphasizes the importance of participating in clinical research trials when appropriate to ensure his patients are receiving the most up-to-date, cutting edge treatment for their disease.

Littleton, CO Littleton, CO, Littleton, CO

Charles Leonard, MD

Radiation Oncologist

Accepting new patients

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Provider Biography

Dr. Leonard is a board-certified radiation oncologist who has been practicing at Rocky Mountain Cancer Centers for over 25 years. He treats a wide variety of cancers, with a special interest in breast cancers and prostate cancer. His areas of expertise include targeted radiation therapy, stereotactic radiosurgery (SRS), stereotactic body radiation therapy (SBRT), intensity-modulated radiation therapy (IMRT), image guided radiotherapy (IGRT), 3-D conformal radiation therapy, and accelerated partial breast irradiation (ABPI).

Dr. Leonard treats each patient the way he would want to be treated himself. He learns about each patient’s unique situation, listens to their needs, explores all options, and strives to do the right thing for them, physically, emotionally, and socially.

Dr. Leonard participates in many tumor boards, where he collaborates with other cancer specialists including surgeons, radiologists, pathologists, and medical oncologists. This allows him to provide a comprehensive, multi-disciplinary approach to his cancer treatment recommendations. Along with his radiation oncology partners, Dr. Leonard was instrumental in the development of accelerated partial breast irradiation, maintaining one of the largest databases in the world for intensity modulated accelerated partial breast irradiation, in which small breast tumors can be treated over just one week.

Dr. Leonard has served as principal investigator for many clinical trial studies and emphasizes the importance of participating in clinical research trials when appropriate to ensure his patients are receiving the most up-to-date, cutting edge treatment for their disease.

Provider Specialties

Breast Cancer
Benign/Non-Cancerous Diseases
- Keloids
Central Nervous System (CNS) Tumors
- Adenomas
- Gilomas
- Meningiomas
- Schwannomas
Gastrointestinal Cancers
- Anal Cancer
- Colorectal Cancer
- Liver Cancer
- Pancreatic Cancer
- Stomach Cancer
General Radiation Oncology
- 3D Conformational Radiation Therapy
- Accelerated Partial Breast Irradiation (ABPI)
- Image-Guided Radiation Therapy (IGRT)
- Intensity-Modulated Radiation Therapy (IMRT)
- Stereotactic Body Radiation Therapy (SBRT)
- Stereotactic Radiosurgery (SRS, brain and spine)
- Volumetric Modulated Arc Therapy (VMAT)
Genitourinary Cancers
Gynecologic Cancers
- Overview
- Cervical Cancer
- Uterine Cancer
- Vaginal Cancer
- Vulvar Cancer
Head and Neck Cancers
- Laryngeal Cancer
- Nasopharyngeal Cancer
- Oral Cavity Cancer
- Oropharyngeal Cancer
- Salivary Gland Cancer
- Sinonasal Cancer
- Thyroid Cancer
- Tongue Cancer
Lymphomas
- Overview
- Non-Hodkin Lymphoma
- Hodgkin's Lymphoma
Oligometastatic Cancers
Radionuclide Therapy
Sarcoma
Skin Cancers
- Overview
- Basal Cell Cancer
- Melanoma
- Merkel Cell Cancer
- Squamous Cell Cancer
Thoracic Cancers
- Esophageal Cancer
- Lung Cancer
- Mesothelioma
- Thymoma

Care Philosophy

When it comes to caring for my patients, I care for people in the manner that I would want to be treated.

Locations

22 W. Dry Creek Cir.
Littleton, CO 80120

303-730-4700

Fax: 303-730-4790

8:00am - 5:00pm | M-F

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22 W. Dry Creek Cir.
Littleton, CO 80120

303-730-4700

Request Appointment View Details

22 W. Dry Creek Cir.
Littleton, CO 80120

303-730-4700

Fax: 303-930-8053

8:00am - 5:00pm | M-F

Request Appointment View Details

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Education

Residency

Chief Resident, Radiation Oncology and Biophysics, The George Washington University Hospital, Washington, DC

Medical School

Vanderbilt University Medical School, Nashville, TN

Board Certifications

Radiation Oncology

Memberships

American Association for the Advancement of Science
American College of Radiology
American Society of Therapeutic Radiology and Oncology

Articles

RMCC Physicians Honored in 5280 Magazine’s “Top Docs”2025 List

1 min read

Videos

Publications

Show Publications
- RY Lei, DL Carter, AG Antell, MA Nowels, SP Tole, JP Bennett, M Turner, FL Baehner, CE Leonard A Comparison of Predicted Ipsilateral Tumor Recurrence Risks in Patients With Ductal Carcinoma in Situ of the Breast After Breast-Conserving Surgery by Breast Radiation Oncologists, the Van Nuys Prognostic Index, the Memorial Sloan Kettering Cancer Centers DCIS Nomogram, and the 12-Gene DCIS Score Assay. Advances in Radiation Oncology, Volume 6, Issue 2.
  
  RY Lei, CE Leonard, MA Nowels, V Katamaneni, DL Carter Patterns of Surgical and Radiation Treatment for Early-Stage Breast Cancer in the State of Colorado International Journal of Radiation Oncology, Biology, Physics, 93 (3), E371
  
  RY Lei, CE Leonard, KT Howell, PL Henkenberns, TK Johnson, TL Hobart, JM Kercher, JL Widner, T Kaske, LD Barke, DL Carter External beam accelerated partial breast irradiation yields favorable outcomes in patients with prior breast augmentation. Frontiers in oncology, 4, 154
  
  M Alvarado, D Carter, JM Guenther, J Hagans, R Lei, CE Leonard, J Manders, AP Sing, MS Broder, E Chang, D Cherepanov, WC Hsiao, M Schultz Clinical utility of the 12-gene DCIS score assay: Impact on treatment (Tx) recommendations Journal of Clinical Oncology 32 (15_suppl), 11050-11050
  
  C Leonard, S Tole, M Turner, J Bennett, K Howell, D Carter Association of the 12-gene Breast DCIS Score® assay with local recurrence in patients with ductal carcinoma in situ treated on accelerated partial breast radiotherapy protocols. Research Square, 10.21203/rs.3.rs-116082/v1
  
  CE Leonard, SP Fryman, MP Turner, JP Bennett, DL Carter, AP Sing Association of OncotypeDX® DCIS ScoreTM results with local recurrence in patients with DCIS treated on accelerated partial breast radiotherapy (APBI) protocols. Cancer Research 78 (4 Supplement), P4-15-08-P4-15-08
  
  CE Leonard, SP Fryman, MP Turner, JP Bennett, DL Carter, AP Sing Association of OncotypeDX (R) DCIS Score (TM) results with local recurrence in patients with DCIS treated on accelerated partial breast radiotherapy (APBI) protocols. CANCER RESEARCH 78 (4)
  
  JB Manders, HM Kuerer, BD Smith, C McCluskey, WB Farrar, TG Frazier, L Li, CE Leonard, DL Carter, S Chawla, LE Medeiros, JM Guenther, LE Castellini, DJ Buchholz, EP Mamounas, IL Wapnir, KC Horst, AChagpar, SB Evans, AI Riker, FS Vali, LJ Solin, L Jablon, A Recht, R Sharma, R Lu, AP Sing, ES Hwang, J White Clinical utility of the 12-gene DCIS score assay: impact on radiotherapy recommendations for patients with ductal carcinoma in situ. Annals of surgical oncology 24 (3), 660-668
  
  CE Leonard, RD Sobus, S Fryman, S Sedlacek, J Kercher, J Widner, L Asmar, Y Wang, K Howell, L Barke, D Carter A randomized trial of accelerated breast radiotherapy utilizing either 3-dimensional radiotherapy versus intensity modulated radiotherapy Cancer Research 77 (4 Supplement), P1-10-03-P1-10-03
  
  M Alvarado, DL Carter, JM Guenther, J Hagans, RY Lei, CE Leonard, JManders, AP Sing, MS Broder, D Cherepanov, E Chang, M Eagan, W Hsiao, M J Schultz The impact of genomic testing on the recommendation for radiation therapy in patients with ductal carcinoma in situ: A prospective clinical utility assessment of the 12‐gene DCIS score™ result Journal of Surgical Oncology 111 (8), 935-340
  
  CE Leonard, RY Lei, MD Alvarado, J Guenther, JE Hagans, JB Manders, MJ Schultz, AP Sing, MS Broder, E Chang, D Cherepanov, M Eagan, WC Hsiao, DL Carter Clinical Utility of the 12-Gene Ductal Carcinoma In Situ (DCIS) Score Assay: Impact on Treatment (tx) Recommendations International Journal of Radiation Oncology• Biology• Physics 90 (1), S223-S224
  
  RY Lei, CE Leonard, KT Howell, RM LaPorte, PL Henkenberns, SP Fryman, RD Higdon, JL Widner, LD Barke, DL Carter Disease Control Efficacy of Ductal Carcinoma In Situ (DCIS) Treated With Accelerated Partial Breast Irradiation (APBI) International Journal of Radiation Oncology• Biology• Physics 87 (2), S196
  
  Rachel Y Lei, Charles E Leonard, Kathryn T Howell, Phyllis L Henkenberns, Timothy K Johnson, Tracy L Hobart, Shannon P Fryman, Jane M Kercher, Jodi L Widner, Terese Kaske, Dennis L Carter Four-year clinical update from a prospective trial of accelerated partial breast intensity-modulated radiotherapy (APBIMRT). Breast Cancer Research and Treatment 140(1), 119-133
  
  Charles E Leonard, Michael Tallhamer, Tim Johnson, Kari Hunter, Kathryn Howell, Jane Kercher, Jodi Widener, Terese Kaske, Devchand Paul, Scot Sedlacek, Dennis L Carter Clinical experience with image-guided radiotherapy in an accelerated partial breast intensity-modulated radiotherapy protocol. International Journal of Radiation Oncology• Biology• Physics 76(2), 528-534
  
  KE Rusthoven, DL Carter, K Howell, JM Kercher, P Henkenberns, KL Hunter, CE Leonard Accelerated Partial-Breast Intensity-Modulated Radiotherapy Results in Improved Dose Distribution When Compared With Three-Dimensional Treatment-Planning Techniques. International Journal of Radiation Oncology• Biology• Physics 70 (1) 296-302