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2025 ICD-10-CM code O30.012

Twin pregnancy with a single chorion and single amnion, occurring during the second trimester of pregnancy.

Use additional code from category Z3A to identify the specific week of the pregnancy.

This code signifies a high-risk pregnancy requiring increased surveillance and specialized care due to the potential complications associated with monochorionic-monoamniotic twins.

Obstetricians and other healthcare professionals involved in prenatal care are responsible for diagnosing and managing this high-risk pregnancy condition.

In simple words: A twin pregnancy where the babies share one sac (monoamniotic) and one outer membrane (monochorionic) during the second trimester (weeks 14-27) of pregnancy.

This code describes a twin pregnancy where both fetuses share a single chorionic and amniotic sac. This condition occurs during the second trimester of pregnancy, defined as 14 weeks 0 days to less than 28 weeks 0 days of gestation.

Example 1: A pregnant woman at 16 weeks gestation undergoes an ultrasound that reveals a twin pregnancy with a single chorionic and amniotic sac., A 20-week pregnant woman with a confirmed monochorionic-monoamniotic twin pregnancy presents for a routine prenatal check-up., A patient at 25 weeks gestation with a monochorionic-monoamniotic twin pregnancy experiences preterm labor.

Documentation should include ultrasound findings confirming monochorionic-monoamniotic twins and the gestational age.

** This code is used only on the maternal record, never on the newborn record. This condition is associated with significant risks, including twin-to-twin transfusion syndrome (TTTS) and cord entanglement.

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