Phlebitis and thrombophlebitis of unspecified iliac vein

This code signifies inflammation of an unspecified iliac vein, accompanied by the formation of a blood clot within that vein. It represents a deep vein thrombosis (DVT) occurring in the iliac venous system without further specification of laterality.

Use this code when documentation confirms phlebitis and thrombophlebitis of an iliac vein, but the medical record does not specify whether it is the right or left iliac vein. This diagnosis is typically supported by imaging studies (e.g., ultrasound, CT venography) demonstrating a thrombus and inflammatory changes.

• Do not use this code if laterality (right or left iliac vein) is documented; instead, choose a more specific code from the I80.21- series.
• Always review documentation for any underlying causes or contributing factors, such as malignancy or inherited thrombophilia, which may require additional coding.
• This code represents an acute condition; ensure the documentation supports current phlebitis and thrombophlebitis.