Secondary malignant neoplasm of brain

This code signifies the presence of a malignant tumor in the brain that originated from a primary cancer site elsewhere in the body and subsequently spread to the brain. It indicates a metastatic brain tumor, not a primary brain cancer.

Use this code when documentation explicitly states "metastatic brain cancer," "secondary malignant neoplasm of brain," or "brain metastases" originating from a known or unknown primary site. This code is appropriate when the brain is the site of the secondary malignancy.

• Always sequence the primary malignant neoplasm code before this code, if known and still active.
• Do not use this code for primary brain tumors; refer to codes in the C70-C72 range for those.
• Ensure documentation clearly distinguishes between primary and secondary brain involvement.