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 these receptors suggests that the tumor's growth is stimulated by estrogen, making it potentially responsive to hormone therapy.

This code is used when a pathology report confirms the estrogen receptor positive status of a malignancy. It is frequently applied in the context of breast cancer diagnosis and staging, as it guides treatment decisions.

• Always verify ER status from the pathology report, not just clinical notes.
• This code is typically used as a secondary diagnosis, following the primary malignancy code.
• Do not use this code if the ER status is unknown or negative.