Cerebral venous thrombosis in pregnancy, unsp trimester

This code signifies the presence of a blood clot within the cerebral veins or dural sinuses of the brain, occurring during any stage of pregnancy. This condition can lead to serious neurological complications due to impaired blood drainage from the brain.

Apply this code when documentation confirms a diagnosis of cerebral venous thrombosis in a pregnant patient, and the specific trimester is not specified or is unknown. This diagnosis is typically supported by imaging studies such as MRI or CT venography.

• Do not use this code if the trimester is clearly documented; instead, select the appropriate trimester-specific code (O22.51, O22.52, O22.53).
• Always 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.
• Ensure documentation specifies "in pregnancy" to differentiate from cerebral venous thrombosis occurring outside of pregnancy (e.g., I67.6).