Conjoined twin pregnancy, first trimester

This code signifies a pregnancy involving conjoined twins, meaning the fetuses are physically joined together, and the pregnancy is currently in the first trimester (up to the end of the 13th week of gestation). This is a rare and complex form of multiple gestation.

This code is used when ultrasound or other diagnostic imaging confirms the presence of conjoined twins during the initial trimester of pregnancy. Documentation should clearly state "conjoined twins" and specify the gestational age or trimester.

• Always confirm the specific trimester documented; this code is exclusively for the first trimester.
• Do not confuse with other multiple gestation codes (e.g., O30.00- for unspecified multiple gestation) or codes for non-conjoined twins.
• Ensure the medical record explicitly states "conjoined twins" and the gestational age to support this specific diagnosis.