Anemia complicating pregnancy, first trimester

This code identifies the presence of anemia in a pregnant patient during her first trimester. Anemia, characterized by a reduced number of red blood cells or hemoglobin, is considered a complication of the pregnancy in this context.

Apply this code when a pregnant patient presents with a documented diagnosis of anemia, and the encounter occurs during the first trimester (up to the end of the 13th week of gestation). Documentation should clearly state the presence of anemia and the gestational age or trimester.

• Always sequence this code as a secondary diagnosis, following a code from category O09 (Supervision of high-risk pregnancy) or Z3A (Gestational age).
• Do not use this code if the anemia is unrelated to the pregnancy; instead, code the specific type of anemia.
• Ensure the medical record explicitly states "first trimester" or provides gestational weeks that fall within the first trimester.