Estrogen receptor positive status [ER+]

This code indicates that a tumor, typically breast cancer, has been tested and found to express estrogen receptors. The presence of estrogen receptors suggests that the tumor's growth is fueled by estrogen, making it potentially responsive to hormone therapy.

Apply this code when pathology reports confirm estrogen receptor positivity in a malignant neoplasm. It is frequently used in conjunction with a primary malignancy code to provide more specific information about the tumor's characteristics for treatment planning and prognosis.

• Always sequence this code after the definitive code for the primary malignancy.
• Ensure documentation clearly states "estrogen receptor positive" or "ER+" based on pathology results.
• Do not use this code for tumors that are estrogen receptor negative (ER-).