Hydrops fetalis not due to isoimmunization

This code represents a severe and often fatal condition in a fetus characterized by generalized edema (fluid accumulation) in at least two fetal compartments, such as ascites, pleural effusion, pericardial effusion, and skin edema. It signifies hydrops fetalis that is not caused by Rh incompatibility or other blood group antigen-antibody reactions between mother and fetus.

Use this code when documentation clearly indicates a diagnosis of non-immune hydrops fetalis. This typically arises from underlying fetal anomalies, infections, cardiac defects, chromosomal abnormalities, or metabolic disorders. Supporting documentation should specify the absence of isoimmunization as the cause.

• Differentiate carefully from hydrops fetalis due to isoimmunization (e.g., Rh disease), which has a distinct code.
• Always look for documentation specifying "non-immune" or ruling out isoimmunization.
• Code any underlying fetal conditions or anomalies identified as the cause of the non-immune hydrops, if known.