Phlebitis and thrombophlebitis of unspecified popliteal vein

This code signifies inflammation of an unspecified popliteal vein, accompanied by the formation of a blood clot (thrombophlebitis). It indicates a venous thromboembolic event affecting the popliteal vein without further specification of laterality (right or left). This condition can lead to pain, swelling, and warmth in the posterior knee and calf region.

Use this code when documentation clearly states phlebitis or thrombophlebitis of the popliteal vein, but the specific side (right or left) is not identified. This typically occurs when the physician's notes or diagnostic reports do not specify laterality. Supporting documentation includes physician notes detailing the diagnosis, ultrasound reports confirming the thrombus, and imaging studies.

• Avoid using this code if laterality (right or left) is documented; instead, choose the more specific I80.221 or I80.222.
• Ensure the documentation explicitly mentions "popliteal vein" to differentiate from other deep vein thromboses.
• Consider sequencing this code after any underlying conditions contributing to the thrombophlebitis, such as malignancy or hypercoagulable states.