Eclampsia complicating pregnancy, third trimester

This code signifies the occurrence of eclampsia, a severe complication of pre-eclampsia characterized by new-onset grand mal seizures, during the third trimester of pregnancy. Eclampsia is a life-threatening condition for both the mother and fetus, requiring immediate medical intervention.

Use this code when a pregnant patient in her third trimester presents with or develops eclamptic seizures. Documentation must clearly state the diagnosis of eclampsia and confirm the gestational age falls within the third trimester (typically defined as 28 weeks gestation to delivery).

• Always confirm the trimester of pregnancy from the medical record.
• Distinguish eclampsia from pre-eclampsia without seizures (O14.-) and from gestational hypertension (O13.-).
• Sequence this code as the principal diagnosis when eclampsia is the reason for the encounter, followed by codes for any associated complications.