Protozoal diseases complicating pregnancy, second trimester

This code signifies a maternal protozoal infection that is adversely affecting a pregnancy during the second trimester. It indicates a direct complication of the pregnancy due to the protozoal disease, rather than an incidental finding. Examples include toxoplasmosis, malaria, or trichomoniasis occurring during this specific gestational period.

Apply this code when documentation clearly links a confirmed protozoal infection to a complication of the pregnancy, and the patient is in her second trimester. Supporting documentation includes physician notes detailing the protozoal diagnosis, its impact on the pregnancy, and the gestational age. This code is appropriate when the protozoal disease is the primary reason for the encounter or a significant co-morbidity.

• Always sequence the code for the specific protozoal infection (e.g., B58.9 for toxoplasmosis) as a secondary diagnosis.
• Ensure documentation specifies "second trimester" to avoid miscoding to O98.611 (first trimester) or O98.613 (third trimester).
• Do not use this code if the protozoal infection is merely present but not documented as complicating the pregnancy; in such cases, only code the protozoal infection.