If a trimester is not indicated in the code book for a Chapter 15 code, it is because the condition always occurs in a specific trimester or the concept of trimester or pregnancy is not applicable.

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Chapter 15 codes in the ICD-10 that do not specify a trimester are designed that way because the condition either always occurs in a specific trimester, making the designation unnecessary, or because the condition is not related to the timing within the pregnancy, rendering the concept of trimester inapplicable.

If a Trimester Is Not Indicated in the Code Book