ICD 9 CM Codes

Additional
ABO isoimmunization
656.20Isoimmunization from other and unspecified blood-group incompatibility, unspecified as to episode of care or not applicable
656.21Isoimmunization from other and unspecified blood-group incompatibility, delivered, with or without mention of antepartum condition
656.23Isoimmunization from other and unspecified blood-group incompatibility, antepartum condition or complication