Hemolytic disease of fetus or newborn due to other and unspecified isoimmunization

This code signifies a condition where the red blood cells of a fetus or newborn are destroyed by antibodies from the mother, caused by an incompatibility in blood types other than Rh factor. This isoimmunization leads to anemia and other complications in the infant.

Apply this code when documentation specifies hemolytic disease in a neonate or fetus due to blood group incompatibilities such as ABO, Kell, Duffy, or other minor blood groups. This diagnosis is typically made based on serological testing of maternal and fetal/neonatal blood.

• Ensure documentation clearly specifies "other" or "unspecified" isoimmunization, differentiating it from Rh incompatibility.
• Do not use this code for hemolytic disease due to Rh isoimmunization (refer to category 773.0 or 773.1).
• Consider sequencing this code as a principal diagnosis when it is the primary reason for admission or treatment of the newborn.