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2025 ICD-10-CM code O31.8X91

Other complications specific to multiple gestation, unspecified trimester, fetus 1.

Only use this code on the maternal record, never the newborn's record. Use an additional code from category Z3A to identify the specific week of pregnancy if known. Do not use this code for supervision of normal pregnancy (Z34.-).Do not use this code for delayed delivery of the second twin/triplet, etc. (O63.2) or malpresentation (O32.9).

The medical necessity of using O31.8X91 is determined by the presence of a diagnosable complication affecting fetus 1 in a multiple gestation pregnancy. This code is only for use in the maternal record.

The provider is responsible for documenting the specific complication affecting fetus 1 and, if known, the trimester in which it occurred.This requires careful monitoring and assessment of each fetus in a multiple gestation pregnancy.

In simple words: This code indicates that the first baby in a twin (or higher-order multiple) pregnancy has a complication not otherwise specified, and it's unknown in which trimester this complication occurred.

This code describes other complications specific to a multiple gestation pregnancy, affecting fetus 1, when the trimester is unspecified.

Example 1: A pregnant woman carrying twins presents for a routine checkup. Ultrasound reveals that Fetus 1 has a single umbilical artery, a condition not otherwise classified in the O31 category. The trimester is not specified in the documentation. O31.8X91 is used to code this condition., A woman pregnant with triplets is admitted to the hospital in her second trimester with concerns about Fetus 1's growth. After extensive testing, it's determined that Fetus 1 is experiencing growth restriction, not otherwise specified. O31.8X91 would be appropriate if documentation does not specify the trimester of the growth restriction. , A patient pregnant with twins develops pre-eclampsia in her third trimester.Ultrasound findings indicate that Fetus 1 also shows signs of a condition not fitting the descriptions under O31, though the specific trimester is not documented for this additional condition.O31.8X91 could be used in this scenario if the trimester is not specified.

Documentation should clearly specify the complication affecting fetus 1. Ideally, the trimester of the pregnancy when the complication occurred should also be documented. The diagnosis should be supported by relevant clinical findings, such as ultrasound reports, laboratory results, or physical examination findings.

** This code is specifically for complications affecting Fetus 1 in a multiple pregnancy. For complications affecting other fetuses, use the appropriate corresponding code (e.g., O31.8X92 for Fetus 2, O31.8X93 for Fetus 3, etc.).This code requires a 7th character to indicate the trimester: 0 (unspecified trimester), 1 (first trimester), 2 (second trimester), or 3 (third trimester). As it ends in 'X', the 7th character is required.

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