Kernicterus of fetus or newborn not due to isoimmunization

This code represents kernicterus, a severe neurological condition in a fetus or newborn caused by extremely high levels of bilirubin, leading to brain damage. This specific code is used when the hyperbilirubinemia is not a result of Rh or ABO incompatibility (isoimmunization). The bilirubin crosses the blood-brain barrier, depositing in brain tissue and causing irreversible damage.

Use this code for newborns diagnosed with kernicterus where the underlying cause of hyperbilirubinemia is determined to be something other than isoimmunization, such as prematurity, G6PD deficiency, or other non-immune hemolytic anemias. Documentation should clearly state the diagnosis of kernicterus and explicitly rule out isoimmunization as the etiology.

• Always sequence this code after the underlying cause of the hyperbilirubinemia, if known and documented.
• Ensure documentation explicitly states "not due to isoimmunization" or provides an alternative non-immune cause for the hyperbilirubinemia leading to kernicterus.
• Distinguish carefully from kernicterus due to isoimmunization, which is coded differently.