Streptococcus B carrier state complicating childbirth

This code identifies a pregnant patient who is a known carrier of Group B Streptococcus (GBS) and is currently in the process of childbirth. It signifies the presence of GBS colonization during labor and delivery, indicating a potential risk of transmission to the neonate.

Use this code when documentation explicitly states that a patient in labor is a GBS carrier. This typically follows a positive GBS screening culture performed during the late third trimester, or if the patient has a history of GBS bacteriuria during the current pregnancy.

• Always sequence this code after the primary obstetric code indicating the type of delivery (e.g., O80, O82).
• Do not use this code for GBS colonization identified before the onset of labor; use O99.820 for antenatal GBS carrier state.
• Ensure documentation specifies "carrier state" or "colonization" during childbirth, not active GBS infection.