What is coded as the Radiation Primary Treatment Volume for a total mastectomy patient?

For a patient who has undergone a total mastectomy, the Radiation Primary Treatment Volume is coded as "Breast-whole." This classification is appropriate because a total mastectomy involves the complete removal of breast tissue, meaning that any subsequent radiation treatment would typically target the entire area of the breast that has been removed.

Following this procedure, radiation therapy might be administered to the chest wall to eliminate any residual microscopic disease and reduce the risk of recurrence. This focus on the entire breast area reflects the concept that post-operative radiation may be aimed at all tissue that originally comprised the breast.

The other options do not accurately represent the intended treatment area. "Chest/lung (NOS)" does not specifically indicate a targeted treatment area for breast cancer. "Breast-partial" would imply that only part of the breast is involved, which does not pertain to a total mastectomy scenario. "Chest wall" refers to the specific structure beneath the breast tissue but does not fully encompass the concept of the whole breast being treated following a total mastectomy. Thus, "Breast-whole" is the most accurate and relevant coding for the Radiation Primary Treatment Volume in this context.