Quad preg w two or more monochorionic fetuses, first tri

This diagnosis code signifies a quadruplet gestation where at least two of the fetuses share a single chorion, occurring specifically within the first trimester. This indicates a higher-order multiple pregnancy with a shared placental structure for some of the fetuses, which carries increased risks.

This code is appropriate for documenting a confirmed quadruplet pregnancy with monochorionic components identified during the first trimester. Documentation must clearly state the number of fetuses, the chorionicity (specifically noting at least two monochorionic fetuses), and the gestational age or trimester.

• Ensure documentation specifies "quadruplet" and "monochorionic" for at least two fetuses.
• Verify the trimester of diagnosis; this code is specific to the first trimester.
• Do not confuse with codes for dichorionic or trichorionic quadruplet pregnancies, or those without specified chorionicity.