Diseases of the circ sys comp pregnancy, second trimester

This code signifies the presence of a pre-existing or newly diagnosed circulatory system disorder that is adversely affecting a pregnant patient during her second trimester. This includes conditions such as hypertension, heart disease, or venous thromboembolism, which can pose risks to both the mother and the fetus. The circulatory issue is considered a complication directly related to the pregnancy.

Apply this code when a pregnant patient in her second trimester is diagnosed with a circulatory system disease that is complicating the pregnancy. Documentation should clearly state the specific circulatory condition and its impact on the pregnancy, along with the gestational age or trimester. This code is appropriate for conditions requiring increased monitoring or management due to the pregnancy.

• Always sequence the specific circulatory condition code (e.g., I10 for essential hypertension) as the primary diagnosis, followed by this O-code.
• Ensure the medical record explicitly states "second trimester" or provides gestational weeks (e.g., 14-27 weeks) to support trimester specificity.
• Do not use this code for circulatory conditions that are incidental findings and not complicating the pregnancy; instead, use the appropriate circulatory system code without an O-code.