`P55.1` ABO isoimmunization of newborn

Billable ICD-10-CM code, FY2026.

Risk adjustment (HCC)

Defines the logic of DRG(s) 794 in MDC 15.

773.1 Hemolytic disease of fetus or newborn due to ABO isoimmunization (approximate)

Type 1 Excludes: D58 Other hereditary hemolytic anemias ("hemolytic anemia of the newborn (P55.-)")
Type 2 Excludes: D59.1 Other autoimmune hemolytic anemias ("hemolytic disease of newborn (P55.-)")
Type 1 Excludes: K72 Hepatic failure, not elsewhere classified ("icterus of newborn (P55-P59)")
Code Also: K76.82 Hepatic encephalopathy ("icterus of newborn (P55-P59)")
Type 1 Excludes: P58 Neonatal jaundice due to other excessive hemolysis ("jaundice due to isoimmunization (P55-P57)")
Type 1 Excludes: R17 Unspecified jaundice ("neonatal jaundice (P55, P57-P59)")
Type 1 Excludes: R71 Abnormality of red blood cells ("newborn anemia due to isoimmunization (P55.-)")
Type 1 Excludes: R76.0 Raised antibody titer ("isoimmunization affecting newborn (P55.-)")

Abocclusion › hemolytic disease (newborn)
Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound) › newborn › due to › ABO (antibodies, isoimmunization, maternal/fetal incompatibility)
Disease, diseased › hemolytic (newborn) › due to or with › incompatibility › ABO (blood group)
Erythroblastosis (fetalis) (newborn) › due to › ABO (antibodies) (incompatibility) (isoimmunization)
Immunization › ABO › in newborn
Incompatibility › ABO › newborn
Isoimmunization NEC › newborn › ABO (blood groups)
Jaundice (yellow) › newborn › due to or associated with › ABO › antibodies
Jaundice (yellow) › newborn › due to or associated with › ABO › incompatibility, maternal/fetal
Jaundice (yellow) › newborn › due to or associated with › ABO › isoimmunization
Jaundice (yellow) › newborn › due to or associated with › hemolytic disease › ABO isoimmunization