ICD-10-CM 2027
ICD-10 code for hemolytic disease newborn abocclusion
From the official ICD-10-CM alphabetic index entry “Abocclusion › hemolytic disease (newborn)”. Page updated September 29, 2026.
About coding hemolytic disease newborn abocclusion
The ICD-10-CM code for hemolytic disease newborn abocclusion is P55.1 (ABO isoimmunization of newborn).
Within P55 (hemolytic disease of newborn), P55.1 is specifically for ABO isoimmunization of newborn. Related codes cover Rh isoimmunization of newborn (P55.0), other hemolytic diseases of newborn (P55.8) and unspecified (P55.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 794 (Neonate with Other Significant Problems, relative weight 1.4935), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about hemolytic disease newborn abocclusion ICD-10 codes
What is the ICD-10 code for hemolytic disease newborn abocclusion?
- P55.1 — ABO isoimmunization of newborn.
Is P55.1 billable?
- Yes. P55.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can P55.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict P55.1 as a principal diagnosis.
Is P55.1 a CC or MCC?
- No. P55.1 is neither a CC nor an MCC under MS-DRG v44.0.