Oth infect w sexl mode of transmiss comp preg, third tri

This code signifies the presence of a sexually transmitted infection (STI) other than those specifically classified elsewhere, occurring during the third trimester of pregnancy. These infections can include conditions like trichomoniasis, chancroid, or granuloma inguinale, which have the potential to impact both maternal and fetal health.

Apply this code when a pregnant patient in her third trimester is diagnosed with an STI that is not explicitly covered by other O98 subcategories (e.g., syphilis, gonorrhea, chlamydia, herpes). Documentation should clearly identify the specific STI and confirm the gestational trimester.

• Ensure the documentation specifies the third trimester of pregnancy.
• Do not use this code if a more specific O98 code exists for the documented STI (e.g., O98.113 for syphilis).
• Always sequence this code as a secondary diagnosis, with a code from category Z3A indicating the weeks of gestation.