P55.1 ICD-10-CA code: ABO isoimmunization of fetus and newborn
P55.1 is the ICD-10-CA code for “ABO isoimmunization of fetus and newborn” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
P55.1ABO isoimmunization of fetus and newborn
ICD-10-CA · Canada · Also written P551
Index terms
Entries in CIHI’s alphabetical index that lead to P55.1. Searching the index by the condition the note names is how coders reach this code.
- Incompatibility, ABO, fetus or newborn
- ABO hemolytic disease (fetus or newborn)
- Isoimmunization NEC, fetus or newborn, ABO
- Disease, diseased, hemolytic (fetus) (newborn), due to, incompatibility, ABO (blood group)
- Condition, conditions (arising in the perinatal period), incompatibility, ABO, fetus or newborn
- Jaundice (yellow), fetus or newborn (physiological), due to or associated with, ABO, antibodies
- Condition, conditions (arising in the perinatal period), ABO hemolytic disease (fetus or newborn)
- Erythroblastosis (fetalis) (newborn), due to, ABO (antibodies) (incompatibility) (isoimmunization)
- Condition, conditions (arising in the perinatal period), isoimmunization NEC, fetus or newborn, ABO
- Jaundice (yellow), fetus or newborn (physiological), due to or associated with, ABO, isoimmunization
- Anemia, fetus or newborn, due to, ABO (antibodies) (isoimmunization) (maternal/fetal incompatibility)
- Jaundice (yellow), fetus or newborn (physiological), due to or associated with, ABO, incompatibility, maternal/fetal
- Immunization, ABO, affecting management of pregnancy (code to 5th character specification of trimester), in fetus or newborn
- Condition, conditions (arising in the perinatal period), immunization, ABO, affecting management of pregnancy, in fetus or newborn
- Condition, conditions (arising in the perinatal period), disease, diseased, hemolytic (fetus) (newborn), due to, incompatibility, ABO (blood group)
- Condition, conditions (arising in the perinatal period), jaundice (yellow), fetus or newborn (physiological), due to or associated with, ABO, antibodies
- Condition, conditions (arising in the perinatal period), erythroblastosis (fetalis) (newborn), due to, ABO (antibodies) (incompatibility)(isoimmunization)
- Condition, conditions (arising in the perinatal period), jaundice (yellow), fetus or newborn (physiological), due to or associated with, ABO, isoimmunization
- Condition, conditions (arising in the perinatal period), anemia, fetus or newborn, due to, ABO (antibodies) (isoimmunization) (maternal/fetal incompatibility)
- Condition, conditions (arising in the perinatal period), jaundice (yellow), fetus or newborn (physiological), due to or associated with, ABO, incompatibility, maternal/fetal
Notes for P55.1
As CIHI prints them, with any note P55.1 takes from the headings above it.
Includes
- Conditions that have their origin in the perinatal period even though death or morbidity occurs laterFrom Chapter 16: Certain conditions originating in the perinatal period (P00-P96)
Excludes
Conditions classified elsewhere.
- Congenital stenosis and stricture of bile ducts (Q44.3)Crigler-Najjar syndrome (E80.5)Dubin-Johnson syndrome (E80.6)Gilbert's syndrome (E80.4)hereditary haemolytic anaemias (D55-D58)From P50-P61 Haemorrhagic and haematological disorders of fetus and newborn
- Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)tetanus neonatorum (A33)whooping cough (A37.-)From Chapter 16: Certain conditions originating in the perinatal period (P00-P96)
Where P55.1 sits
- 1ChapterChapter 16: Certain conditions originating in the perinatal period (P00-P96)
- 2Block P50-P61Haemorrhagic and haematological disorders of fetus and newborn
- 3Category P55Haemolytic disease of fetus and newborn
- 4Valid code P55.1ABO isoimmunization of fetus and newborn
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code P55.1 mean?
P55.1 is the ICD-10-CA code for “ABO isoimmunization of fetus and newborn” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is P55.1 in ICD-10-CA?
P55.1 sits under P55 Haemolytic disease of fetus and newborn, within P50-P61 Haemorrhagic and haematological disorders of fetus and newborn, within Chapter 16: Certain conditions originating in the perinatal period (P00-P96).
What coding notes apply to P55.1?
ICD-10-CA lists Excludes, Includes notes for P55.1, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.