Amniotic fluid embolism in pregnancy, unspecified trimester

This code signifies a rare, life-threatening obstetric emergency characterized by the sudden, acute collapse of a pregnant individual due to the entry of amniotic fluid or fetal material into the maternal circulation. This event triggers an anaphylactoid reaction, leading to cardiorespiratory collapse, coagulopathy, and often disseminated intravascular coagulation (DIC). The "unspecified trimester" indicates that the timing of the pregnancy is not documented.

Apply this code when documentation clearly states a diagnosis of amniotic fluid embolism occurring during pregnancy, without specifying the trimester. This diagnosis is typically made clinically based on the rapid onset of dyspnea, hypotension, cyanosis, and coagulopathy in a pregnant patient. Supporting documentation would include physician notes detailing the clinical presentation, diagnostic workup, and the confirmed diagnosis.

• Ensure the documentation explicitly states "amniotic fluid embolism" and that the pregnancy is ongoing.
• Do not use this code if the trimester is specified; instead, select the appropriate trimester-specific code (O88.111, O88.112, O88.113).
• Always sequence this code as a principal diagnosis when it is the primary reason for the encounter, and code any associated complications (e.g., DIC, cardiac arrest) as secondary diagnoses.