Case: 25-year-old with Type 1 diabetes in the second trimester at 18 weeks; routine follow-up.

Case: 25-year-old with Type 1 diabetes in the second trimester at 18 weeks; routine follow-up.

• A. O24.012, Z3A.08
• B. O24.012, Z3A.18
• C. O24.013, Z3A.18
• D. O24.0, Z3A.18

Answer: (B)

The main idea is to use a code that reflects pre-existing diabetes in pregnancy and the specific diabetes type, plus a code for how far along the pregnancy is. For a patient with Type 1 diabetes prior to conception who is in the second trimester at 18 weeks, the correct pairing is the diabetes-in-pregnancy code that specifies Type 1 and second trimester, together with a gestational-age code. O24.012 identifies pre-existing diabetes mellitus, type 1, in pregnancy, in the second trimester. The gestational age at 18 weeks is added with Z3A.18. This combination accurately communicates both the pre-existing condition and the exact point in gestation. Other options would either imply a different trimester (for example, 8 weeks) or a different diabetes type (such as type 2) or be too general without specifying the diabetes type.

The main idea is to use a code that reflects pre-existing diabetes in pregnancy and the specific diabetes type, plus a code for how far along the pregnancy is. For a patient with Type 1 diabetes prior to conception who is in the second trimester at 18 weeks, the correct pairing is the diabetes-in-pregnancy code that specifies Type 1 and second trimester, together with a gestational-age code. O24.012 identifies pre-existing diabetes mellitus, type 1, in pregnancy, in the second trimester. The gestational age at 18 weeks is added with Z3A.18. This combination accurately communicates both the pre-existing condition and the exact point in gestation. Other options would either imply a different trimester (for example, 8 weeks) or a different diabetes type (such as type 2) or be too general without specifying the diabetes type.