Use additional code:
code from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known. (per Chapter 15)
From Chapter 15:
supervision of normal pregnancy (Z34.-)
From Chapter 15:
mental and behavioral disorders associated with the puerperium (F53)
obstetrical tetanus (A34)
postpartum necrosis of pituitary gland (E23.0)
puerperal osteomalacia (M83.0)
From Chapter 15:
CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
1st trimester- less than 14 weeks 0 days
2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
3rd trimester- 28 weeks 0 days until delivery
O43.02 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
O43.021
Fetus-to-fetus placental transfusion syndrome, first trimester
Billable
10
O43.022
Fetus-to-fetus placental transfusion syndrome, second trimester
Billable
10
O43.023
Fetus-to-fetus placental transfusion syndrome, third trimester