HELLP syndrome (HELLP), second trimester

This code signifies a severe variant of pre-eclampsia, characterized by Hemolysis, Elevated Liver enzymes, and Low Platelet count, occurring specifically during the second trimester of pregnancy. It represents a life-threatening obstetric complication requiring urgent medical intervention.

Apply this code when documentation clearly indicates the presence of HELLP syndrome in a pregnant patient during her second trimester. Supporting documentation should detail laboratory findings consistent with hemolysis, elevated liver enzymes (e.g., AST, ALT), and thrombocytopenia, alongside the gestational age.

• Always confirm the trimester of pregnancy from the medical record; this code is specific to the second trimester.
• Do not confuse with other forms of pre-eclampsia or gestational hypertension without the full HELLP criteria.
• Sequence this code as the principal diagnosis when it is the primary reason for the encounter, followed by codes for any associated complications.