Phlbts and thombophlb of unsp deep vessels of unsp low extrm

This code signifies inflammation of a vein (phlebitis) or inflammation of a vein with a blood clot (thrombophlebitis) occurring in a deep vessel of an unknown lower extremity. The specific deep vein involved is not documented, nor is the laterality (left or right leg) specified.

Use this code when documentation confirms deep vein phlebitis or thrombophlebitis, but the physician's notes do not specify the exact deep vessel (e.g., femoral, popliteal) or which lower extremity is affected. This code is appropriate when the diagnostic workup (e.g., ultrasound) was inconclusive regarding the specific vessel or laterality, or if the documentation simply states "deep vein thrombophlebitis, unspecified lower extremity."

• Avoid using this code if the laterality (left or right) or the specific deep vessel (e.g., femoral, popliteal) is documented. Always seek clarification for more specific coding.
• This code indicates a lack of specificity; prioritize codes that provide more detail regarding the affected vessel and laterality (e.g., I80.21- for femoral, I80.22- for popliteal).
• Ensure the documentation clearly states "deep vessel" to differentiate from superficial thrombophlebitis (I80.0-).