(A female patient underwent a mastectomy on herleft breastlast year due to breast cancer.

When a prior malignancy has been eradicated and the patient is no longer receiving treatment for the primary site, ICD-10-CM directs you to use apersonal history of malignant neoplasmcode rather than an active primary cancer code. Here, the breast cancer was treated successfully last year and no further therapy was required, so the breast cancer ishistory, not active. The new current condition ismetastatic cancer to the liver, which is coded as asecondary malignant neoplasm of liver and intrahepatic bile duct (C78.7). Because the primary breast cancer is not documented as active or under current treatment, you donotcode an active breast malignancy (C50.-). Instead, you addZ85.3 (personal history of malignant neoplasm of breast)to show the prior cancer history relevant to the current metastatic disease. Option A incorrectly codes a primary liver cancer. Option C incorrectly codes active breast cancer. Option D codes metastasis to the adrenal gland, not the liver.