Many of the Codes Within Chapter 15, Pregnancy, Childbirth and the Puerperium

Many of the codes within Chapter 15, Pregnancy, Childbirth and the Puerperium are further defined as to the trimester. There is an instructional note at the beginning of ICD-10-CM Chapter 15 instructing the use of which additional code?

A) 7^th character to identify fetus
B) Category O08 to identify any associated complication
C) Category B95-B97 to identify infectious agent
D) Category Z3A, weeks of gestation to identify specific week of the pregnancy