Amniotic fluid embolism in pregnancy, second trimester

This code signifies a rare, life-threatening obstetric emergency characterized by the sudden, acute collapse of the mother due to an anaphylactoid reaction to fetal cells, amniotic fluid, or other debris entering the maternal circulation during the second trimester of pregnancy. It often presents with sudden respiratory distress, cardiovascular collapse, coagulopathy, and altered mental status.

Assign this code when documentation clearly indicates a diagnosis of amniotic fluid embolism occurring specifically during the second trimester of the current pregnancy. Supporting documentation would include physician notes detailing the acute onset of symptoms consistent with AFE and the gestational age at the time of the event.

• Ensure the documentation explicitly states "second trimester" for accurate code assignment.
• Do not confuse with other types of embolisms (e.g., pulmonary embolism) unless AFE is also diagnosed.
• Sequence this code as a principal diagnosis when it is the primary reason for the encounter, followed by codes for associated complications.