P56.0

Billable

Hydrops fetalis due to isoimmunization

HCC Category Mapping

V28HCC 109 — Hemolytic and Aplastic Anemias

0.291

What This Code Means

Severe fluid accumulation throughout a fetus's body caused by blood type incompatibility between mother and baby, typically due to Rh or ABO incompatibility.

Coding Tips

•Document the specific type of isoimmunization (Rh, ABO, or other) if known, as this may affect treatment decisions
•This condition often requires intrauterine transfusion or early delivery; coordinate coding with obstetric records if available

Clinical Significance

Hydrops fetalis due to isoimmunization represents the most severe form of hemolytic disease with massive fluid accumulation throughout the fetus/newborn, carrying extremely high morbidity and mortality risk. This condition requires immediate intensive intervention including exchange transfusion and aggressive supportive care in specialized neonatal units.

Documentation Requirements

✓Clinical evidence of generalized edema and fluid accumulation
✓Documentation of maternal-fetal blood group incompatibility
✓Evidence of severe hemolytic anemia in newborn
✓Imaging studies showing ascites, pleural effusion, or skin edema
✓Maternal antibody levels and identification
✓Assessment of cardiac function and heart failure
✓Treatment plan including exchange transfusion and supportive care
✓Multidisciplinary care coordination documentation

Commonly Confused Codes

P83.2 — Hydrops fetalis not due to hemolytic disease (non-immune vs immune)P56.90 — Hydrops fetalis due to unspecified hemolytic disease (immune but unspecified)P22.1 — Transient tachypnea of newborn (respiratory vs systemic fluid accumulation)P29.0 — Neonatal cardiac failure (cardiac vs systemic edema)Q89.8 — Other specified congenital malformations (congenital vs acquired)

Code Hierarchy

└P56Hydrops fetalis due to hemolytic disease └P56.0Hydrops fetalis due to isoimmunization

└P56.0Hydrops fetalis due to isoimmunization