The 2nd character defines the particular body system or general physiological system or anatomical region involved.
Obstetrics procedure codes have a first character value of “1”. The second character value for body system is Pregnancy. The root operations Change, Drainage, Extraction, Insertion, Inspection, Removal, Repair, Reposition, Resection and Transplantation are used in the obstetrics section, and have the same meaning as in the medical and surgical section. The obstetrics section also includes two additional root operations, Abortion and Delivery, defined below:
The obstetrics section includes procedures performed on the products of conception only; procedures on the pregnant female are coded in the medical and surgical section (e.g., episiotomy). The term “products of conception” refers to all physical components of a pregnancy, including the fetus, amnion, umbilical cord and placenta. There is no differentiation of the products of conception based on gestational age. Thus, the specification of the products of conception as a zygote, embryo or fetus, or the trimester of the pregnancy, is not part of the procedure code but can be found in the diagnosis code.
The fifth character specifies approaches as defined in the medical and surgical section. The sixth character is used for devices such as fetal monitoring electrodes. Qualifier values are specific to the root operation, and are used to specify the type of extraction (e.g., low forceps, high forceps, low cervical cesarean, etc.), the type of fluid taken out during a drainage procedure (e.g., amniotic fluid, fetal blood, etc.) or the body system of the products of conception on which a repair was performed.