Radiology Coding Alert

Reader Questions:

Submit Code for Primary Tumor In Addition To Metastasis

Question: During radiological assessment in a patient with prostate cancer, our physician noted bone metastasis. How can we report this diagnosis?

Answer: You report diagnosis codes for the metastasis as well as the primary tumor. In the description provided here, when you are reporting prostate cancer that has metastasized to the bones, you’ll report 198.5 (Secondary malignant neoplasm of bone and bone marrow) and 185 (Malignant neoplasm of prostate). The code 198.5 is for the metastasis that your physician has diagnosed on radiological assessment and the code 185 for the primary in the prostate.

ICD-10 options: When ICD-10 is effective later this year, you will report code C79.51 (Secondary malignant neoplasm of bone) for the site of the metastasis in addition to C61 (Malignant neoplasm of prostate) for the primary tumor of the prostate.


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