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Julie A. Billar, M.D.

  1. Surgeon
  2. Surgical Oncologist

Grupos especializados


  1. Phoenix, Arizona



Julie Billar, M.D., is a surgical breast oncologist at Mayo Clinic in Arizona and the Mayo Clinic Comprehensive Cancer Center. She completed her General Surgery residency at Mayo Clinic in Arizona, and subsequently completed a dedicated Breast Surgical Oncology Fellowship at the John Wayne Cancer Institute. Dr. Billar spent the next decade as faculty at Banner MD Anderson Cancer Center in Gilbert, Arizona, where she also served as the Medical Director for the Multi-Disciplinary Breast Program, focusing on collaboration and implementing evidence-based cancer protocols within teams serving the wider Phoenix Metro community.

In 2023, Dr. Billar returned to Mayo Clinic in Arizona, and her clinical practice focuses entirely on patients with breast health needs. She emphasizes patient education and shared decision-making to ensure that the patient remains the center of the care plan. Dr. Billar has special interests in applying advanced surgical techniques for the management of breast cancer, reducing the risk of breast cancer in patients with genetic susceptibility to cancer, and streamlining the multi-disciplinary management of patients with higher risk disease presentations, including inflammatory breast cancer, triple negative breast cancer, patients who present with lymph node metastasis, and patients diagnosed at a young age.

  1. Atypical ductal hyperplasia
  2. Atypical lobular hyperplasia
  3. BRCA gene mutation
  4. Breast cancer
  5. Breast cysts and lumps
  6. Ductal carcinoma in situ
  7. Fibroadenoma
  8. Genetic predisposition to breast cancer
  9. High risk for breast cancer
  10. Inflammatory breast cancer
  11. Invasive breast cancer
  12. Invasive ductal carcinoma
  13. Invasive lobular carcinoma
  14. Lobular carcinoma in situ
  15. Male breast cancer
  16. Paget's disease of the breast
  17. Paget's disease of the nipple
  18. Phyllodes tumor
  19. Triple-negative breast cancer
  1. Axillary dissection
  2. Breast cancer surgery
  3. Breast duct excision
  4. Breast surgery
  5. Excisional biopsy
  6. Lumpectomy
  7. Lymph node sampling
  8. Lymphadenectomy
  9. Mastectomy
  10. Nipple-sparing mastectomy
  11. Oncoplastic breast-conserving surgery
  12. Prophylactic mastectomy
  13. Sentinel lymph node surgery
  14. Sentinel node biopsy
  15. Skin-sparing mastectomy
  • Breast cancer
  • Ductal carcinoma in situ
  • Breast conserving surgery (i.e. lumpectomy, oncoplastic breast surgery)
  • Mastectomy (i.e. nipple-sparing, skin-sparing, total, modified radical)
  • Lymph node surgery (i.e. sentinel lymph node, targeted lymph node dissection, axillary dissection)
  • High risk for breast cancer
  • Inflammatory breast cancer
  • Patient education
  1. 2013
    Fellowship - Breast Surgical OncologyJohn Wayne Cancer Institute
  2. 2012
    ResidentSurgery - General (Categorical) Residency, Surgery, Programs in Arizona, Mayo School of Graduate Medical Education, Mayo Clinic College of Medicine
  3. 2007
    MDUniversity of Rochester School of Medicine and Dentistry
  4. 2003
    BS - Major: MicrobiologyArizona State University


  1. 2013
    General SurgeryAmerican Board of Surgery

Awards and honors

  1. 2012
    Surgery Residency Peer Service Excellence AwardMayo Clinic

Professional memberships

  1. 2019 - 2023
    LeadBreast Surgery, BMDACC Enhanced Recovery Program Committee, Banner MD Anderson Cancer Center
  2. 2013 - present
    MemberAmerican Society of Breast Surgeons
  3. 2012 - present
    MemberAmerican Society of Clinical Oncology
  4. 2012 - present
    MemberSociety of Surgical Oncology


Research activities

See a description of research activities.