Quad preg w two or more monochorionic fetuses, unsp tri

This code signifies a pregnancy involving four fetuses, where at least two of these fetuses share a single chorion. This indicates a higher-risk multiple gestation due to potential complications associated with monochorionic placentation, such as twin-to-twin transfusion syndrome (TTTS) or selective intrauterine growth restriction (sIUGR). The specific gestational age is not documented or is unknown.

Apply this code when documentation confirms a quadruplet pregnancy with two or more monochorionic fetuses, and the trimester is not specified or cannot be determined. This typically occurs during initial ultrasound assessments or when detailed chorionicity information is available but gestational age is not precisely documented for coding purposes.

• Ensure documentation clearly specifies "quadruplet" pregnancy and "two or more monochorionic fetuses."
• Do not use this code if the chorionicity of all fetuses is dichorionic or if only one monochorionic pair exists within the quadruplet pregnancy.
• If the trimester is known, use the more specific O30.21- codes that include the trimester (e.g., O30.211, O30.212, O30.213).