P55.9
Hemolytic disease of newborn, unspecified
P55.9 (also written P559) is a billable ICD-10-CM diagnosis code for hemolytic disease of newborn, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 4 codes in category P55 (Hemolytic disease of newborn). The Alphabetic Index lists it under 8 entries. Its coding notes include 5 Excludes1 entries and 5 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 16 codes are never used on the maternal record, and chapter 15 codes are never used on the newborn record. Chapter 16 codes can be used for life if the condition persists.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (5 notes)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- tetanus neonatorum (A33)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are for use on newborn records only, never on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 8 entries
- Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound), congenital, due to isoimmunization NOS
- Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound), erythroblastic, newborn
- Disease, diseased, hemolytic (newborn)
- Erythroblastosis (fetalis) (newborn)
- Isoimmunization NEC, newborn
- Jaundice (yellow), newborn, due to or associated with, hemolytic disease
- Jaundice (yellow), newborn, due to or associated with, incompatibility, maternal/fetal NOS
- Jaundice (yellow), newborn, due to or associated with, isoimmunization NOS