Prsnl hx of malig neoplm of unsp site lip,oral cav,& pharynx

This code indicates that a patient has a past medical history of a malignant tumor that originated in an unknown or unspecified location within the lip, oral cavity, or pharynx. The primary cancer is no longer present, but its history is relevant for ongoing care and risk assessment.

Assign this code when a patient has a documented history of a malignant neoplasm of the lip, oral cavity, or pharynx, but the specific primary site within these regions was never identified or is not documented. This is typically used for follow-up encounters after successful treatment, surveillance, or when the history impacts current treatment decisions for other conditions.

• Only use this code when the specific primary site within the lip, oral cavity, or pharynx is truly unknown or unspecified in the medical record.
• Do not use this code if the patient currently has a malignant neoplasm; instead, code the active malignancy.
• Always sequence this code as a secondary diagnosis, as it represents a historical condition.