Cerebral venous thrombosis in pregnancy, third trimester

This code signifies the presence of a blood clot within the cerebral veins or dural sinuses occurring during the third trimester of pregnancy. This condition can lead to various neurological symptoms due to impaired blood drainage from the brain.

Apply this code when documentation confirms a diagnosis of cerebral venous thrombosis in a pregnant patient who is specifically in her third trimester. Supporting documentation should include imaging studies (e.g., MRI, CT venography) confirming the thrombosis and a clear indication of the gestational period.

• Ensure the documentation explicitly states "third trimester" for accurate code assignment.
• Do not confuse with cerebral arterial thrombosis or venous thrombosis in other anatomical sites.
• Sequence this code as a primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting the pregnancy.