Which ICD-10-CM code describes hydrocephalus in the second fetus of a twin pregnancy?

Which ICD-10-CM code describes hydrocephalus in the second fetus of a twin pregnancy?

• A. O33.6XX1
• B. O33.6XX2
• C. O33.7XX2
• D. O33.0XX0

Answer: (B)

In ICD-10-CM, when a fetal problem is identified in a multiple pregnancy, you code the specific fetal abnormality and indicate which fetus is affected by the last digit of the code. Hydrocephalus for the fetus uses the 6 in the O33.6XX family, and the final digit shows the fetus number. So O33.6XX2 encodes hydrocephalus in the second fetus of a twin pregnancy. If it were the first fetus, the code would end in 1; a different fetal condition would use a different middle digit (for example, 7 might indicate another specific abnormality). Ending with 0 isn’t used to designate a particular fetus in this context.

In ICD-10-CM, when a fetal problem is identified in a multiple pregnancy, you code the specific fetal abnormality and indicate which fetus is affected by the last digit of the code. Hydrocephalus for the fetus uses the 6 in the O33.6XX family, and the final digit shows the fetus number. So O33.6XX2 encodes hydrocephalus in the second fetus of a twin pregnancy.

If it were the first fetus, the code would end in 1; a different fetal condition would use a different middle digit (for example, 7 might indicate another specific abnormality). Ending with 0 isn’t used to designate a particular fetus in this context.