Thromboembolism in pregnancy, second trimester

This diagnosis code signifies the occurrence of a thromboembolic event, such as deep vein thrombosis (DVT) or pulmonary embolism (PE), specifically during the second trimester of a pregnancy. It indicates a blood clot forming in a blood vessel, obstructing blood flow, and its direct association with the gestational period.

Use this code when documentation clearly states a diagnosis of thromboembolism (e.g., DVT, PE) in a pregnant patient who is currently in her second trimester. Supporting documentation would include physician notes detailing the diagnosis, trimester of pregnancy, and evidence of the thromboembolic event.

• Ensure the documentation explicitly states "second trimester" for accurate code assignment.
• Do not confuse with thromboembolism occurring in other trimesters (O88.211 for first, O88.213 for third).
• Always sequence this code as a secondary diagnosis following the primary obstetric code (e.g., O09.x for supervision of high-risk pregnancy, if applicable).