Other viral diseases complicating pregnancy, third trimester

This code signifies a maternal viral infection, other than those specifically classified elsewhere (e.g., HIV, hepatitis, rubella, herpes simplex), that is adversely affecting a pregnancy in its third trimester. It indicates that the viral disease is considered a complication of the pregnancy, requiring clinical attention or impacting management.

Apply this code when documentation clearly states a pregnant patient in her third trimester has a viral disease (e.g., influenza, parvovirus B19, cytomegalovirus, varicella, enterovirus) that is explicitly noted as complicating the pregnancy. Supporting documentation should include the specific viral diagnosis and the trimester of pregnancy.

• Always sequence this O-code first, followed by the specific code for the viral infection (e.g., B01.9 for Varicella without complication).
• Do not use this code for viral infections that are not documented as complicating the pregnancy; use only the viral infection code in such cases.
• Verify the trimester of pregnancy; using this code for first or second trimester complications would be incorrect.