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2025 ICD-10-CM code O31.1

Continuing pregnancy after spontaneous abortion of one or more fetuses.

Codes from this chapter (O00-O9A) are for use only on maternal records, never on newborn records.Use additional codes from category Z3A to specify the week of gestation if known.Excludes conditions such as obstetrical tetanus, postpartum necrosis of the pituitary gland, and puerperal osteomalacia.

Medical necessity is established by the need for ongoing care and monitoring of the mother and the remaining viable fetus(es) after a spontaneous abortion in a multiple gestation pregnancy. This includes managing risks associated with the loss of one or more fetuses, potential complications, and ensuring a safe delivery.

Obstetrician/Gynecologist.The clinical responsibility includes ongoing monitoring of the mother and the remaining fetus(es), management of any complications arising from the spontaneous abortion, and ensuring a safe delivery of the surviving fetus(es). This may involve regular ultrasounds, fetal monitoring, and close observation for signs of infection or other complications.

IMPORTANT:O31.2 (Continuing pregnancy after intrauterine death of one fetus or more) may be considered if the abortion is considered an intrauterine fetal demise.Additional codes from category Z3A may be used to specify the gestational week.

In simple words: This code is used when a woman is carrying multiples (twins, triplets, etc.), and one or more of the babies are lost through miscarriage, but the other baby or babies continue to develop.

This code signifies the continuation of a pregnancy after the spontaneous abortion of one or more fetuses in a multiple gestation pregnancy.It encompasses situations where, despite the loss of one or more fetuses, the remaining fetus or fetuses continue to develop. The code's application necessitates the presence of both a spontaneous abortion and a continuing pregnancy of at least one other fetus.Specific trimester of the abortion and ongoing pregnancy should be specified using additional codes from category Z3A when possible.

Example 1: A patient presents with a twin pregnancy at 16 weeks. One twin is found to have no heartbeat during routine ultrasound.The other twin shows normal development. O31.1 is assigned to reflect the continued pregnancy of the viable twin after the spontaneous abortion of the other twin., A pregnant woman, carrying triplets at 24 weeks gestation, experiences a spontaneous abortion of one fetus. The other two fetuses are thriving.O31.1 is assigned along with additional codes specifying gestational week to accurately reflect the situation. The additional codes help to further clarify the timing of the abortion and the current stage of the continuing pregnancy., A patient presents at 28 weeks gestation with a history of carrying twins. One twin died in utero at around 20 weeks. The other twin is alive and well.Given the later gestational age, O31.1 is utilized along with codes indicating the death of one fetus and the ongoing viability of the other.

Documentation should include confirmation of multiple gestation, ultrasound findings confirming fetal demise of one or more fetuses, and documentation of the continued viability of at least one fetus.Gestational age at the time of abortion and at the time of coding should be clearly documented.Any medical intervention related to the spontaneous abortion or the ongoing pregnancy must also be recorded.

** This code should not be used for cases involving termination of pregnancy; only spontaneous abortions.

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