In simple words: This code indicates that the patient, who is in her second trimester of pregnancy (between week 14 and week 28), experienced seizures due to a severe form of pregnancy-induced high blood pressure called eclampsia.

Eclampsia is a severe complication of preeclampsia characterized by seizures. This code specifies that the eclampsia is occurring during the second trimester of pregnancy (14 weeks 0 days to less than 28 weeks 0 days).

Example 1: A 22-year-old pregnant woman at 20 weeks gestation presents to the emergency room with a blood pressure of 180/120 mmHg, severe headache, and visual disturbances. She begins experiencing generalized tonic-clonic seizures. She is diagnosed with eclampsia in the second trimester (O15.02) and preeclampsia (O14.1), A pregnant woman at 16 weeks gestation, with known chronic hypertension, arrives at the hospital with a blood pressure of 160/110 and protein in her urine. After admission, she develops a seizure, which is diagnosed as eclampsia and treated with magnesium sulfate., A 30-year-old woman, G2P1, at 25 weeks gestation develops sudden onset seizures at home. Upon arrival at the hospital, her blood pressure is 170/110. Blood tests reveal elevated liver enzymes and low platelets. She is diagnosed with HELLP syndrome (O14.13) and eclampsia.

Documentation should include the following:* Elevated blood pressure readings.* Presence of proteinuria.* Description of seizure activity.* Other symptoms such as headache, visual changes, or right upper quadrant pain.* Laboratory findings.* Treatment provided, including medication administration and fetal monitoring.

** This code is specifically for eclampsia occurring in the second trimester. It's important to distinguish this from eclampsia occurring at other times during pregnancy (O15.01, O15.03, O15.9).