Coding for OB services can be complicated; per the CPT® guidelines, the global OB package includes uncomplicated care to the patient in the antepartum period, delivery and postpartum period.
If a pregnancy is confirmed during a visit, the visit is reported with an Evaluation and Management code (99201-99215) with diagnosis code Z32.01 (encounter for pregnancy test, result positive). The level of service is determined by the key components; history, exam and MDM. The OB Episode should be started at a separate visit.