Antepartum hemorrhage, unspecified, second trimester

This code signifies any instance of vaginal bleeding occurring during the second trimester of pregnancy (weeks 14 through 27+6 days) where the specific cause of the hemorrhage has not been determined or documented. It indicates an uninvestigated or undiagnosed source of bleeding before labor onset.

Use this code when the medical record clearly indicates antepartum hemorrhage in the second trimester, but the physician documentation does not specify the etiology (e.g., placenta previa, placental abruption, vasa previa). Documentation supporting its use would include notes like "vaginal bleeding, second trimester, cause unknown" or "unspecified antepartum hemorrhage, 20 weeks gestation."

• Do not use this code if a definitive cause of the hemorrhage is documented (e.g., use O44.x for placenta previa).
• Ensure the gestational age documented falls within the second trimester (14 weeks 0 days to 27 weeks 6 days).
• Always query the provider for a more specific diagnosis if the cause of the hemorrhage is not documented.