T80.919 ICD-10-CM Code: Hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed

T80.919 is the ICD-10-CM diagnosis code for hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed. T80.919 sits in the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88), within the section covering complications of surgical and medical care, not elsewhere classified (t80-t88).

Header codes like T80.919 cannot be reported on claims directly, they organize child codes that share clinical context but the actual diagnosis must be coded to the highest level of specificity supported by the documentation. Coders should look at T80.919's child codes and select the one that matches the patient's documented presentation, since payers reject header codes submitted as the primary diagnosis. For risk adjustment workflows, header codes never contribute to a Medicare Advantage member's RAF score on their own; only billable child codes that happen to map to a payment HCC affect risk-adjusted plan payments.