Deep phlebothrombosis in pregnancy, third trimester

This code signifies the presence of a deep vein thrombosis (DVT) occurring during the third trimester of a pregnancy. It indicates a blood clot has formed in a deep vein, typically in the legs or pelvis, in a pregnant patient who is in her final trimester.

Use this code when documentation clearly indicates a diagnosis of deep phlebothrombosis (DVT) in a pregnant patient who is specifically in her third trimester. Supporting documentation would include physician notes detailing the DVT diagnosis, the patient's gestational age, and any diagnostic imaging confirming the clot.

• Ensure the documentation explicitly states "deep" phlebothrombosis; superficial thrombophlebitis would be coded differently.
• Verify the trimester is specifically the third; codes exist for DVT in other trimesters.
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity affecting care.