Disseminated malignant neoplasm, unspecified

This code signifies a widespread, metastatic cancerous process where the primary site of origin is unknown or not documented. It indicates that malignant cells have spread extensively throughout the body, affecting multiple distant sites.

Use this code when documentation clearly states "disseminated malignant neoplasm" without identifying a primary tumor site. It is appropriate for cases where extensive metastatic disease is present, but diagnostic workup has not pinpointed the initial cancer location.

• Avoid using this code if a primary site is identified, even if the metastasis is widespread.
• Query the provider for a more specific primary site if possible, as this code offers limited specificity for treatment planning.
• Sequence this code as the principal diagnosis when the disseminated malignancy is the reason for the encounter and the primary site remains unknown.