Multiple gestation, unspecified, third trimester

This code signifies a pregnancy involving more than one fetus where the specific number of fetuses (e.g., twins, triplets) is not documented, and the pregnancy has progressed into the third trimester. It indicates a multifetal pregnancy without further specification of the type or number of gestations.

Apply this code when the medical record clearly states a multiple gestation but lacks detail regarding the exact number of fetuses, and the patient is in her third trimester (typically beginning at 28 weeks gestation). Documentation should confirm the presence of multiple fetuses and the gestational age.

• Do not use if the specific number of fetuses (e.g., twin, triplet) is known; use the more specific O30.0- or O30.1- codes.
• Ensure the documentation explicitly states "third trimester" or provides a gestational age that falls within the third trimester.
• This code is a primary diagnosis for the multiple gestation itself and may be accompanied by codes for any associated complications.