Smoking (tobacco) complicating pregnancy, third trimester

This code signifies the presence of tobacco smoking during the third trimester of pregnancy, indicating a direct complication or adverse effect on the pregnancy due to the maternal smoking. It identifies pregnancies where the mother's tobacco use poses a risk or has already caused issues during the final stage of gestation.

Apply this code when a pregnant patient in her third trimester is documented as actively smoking tobacco, and the clinician explicitly links this smoking to a complication of the pregnancy. Documentation should clearly state "smoking complicating pregnancy" or similar phrasing, specifically noting the third trimester.

• Always ensure the documentation specifies "third trimester" for accurate code assignment.
• Do not use this code for historical smoking or smoking cessation during pregnancy if no current complication is noted.
• Sequence this code after the primary obstetric code (e.g., O80, O09.xx) if the complication is not the primary reason for the encounter.