Cont preg aft spon abort of one fetus or more, 2nd tri, fts1

This code describes a multifetal pregnancy where one or more fetuses have been spontaneously aborted, but at least one fetus continues to be viable and the pregnancy has progressed into the second trimester. It specifically identifies complications related to the loss of one fetus while another remains, occurring between 14 weeks 0 days and 27 weeks 6 days of gestation.

Use this code when documentation clearly indicates a multifetal pregnancy with a confirmed spontaneous abortion of one or more fetuses, and the remaining fetus(es) are still viable in the second trimester. This applies to situations such as a "vanishing twin" phenomenon or other partial fetal loss events in a multiple gestation. Documentation should specify the trimester and the affected fetus number if applicable.

• Ensure the documentation explicitly states "second trimester" and "spontaneous abortion" of one fetus in a multifetal pregnancy.
• Confirm the pregnancy is ongoing with at least one viable fetus.
• Do not confuse with complete spontaneous abortion (O03.-) or other complications of multiple gestation without fetal loss.