HCPCS Level II code J0256 describes an injection of alpha 1 proteinase inhibitor (human), not otherwise specified, 10 mg, typically provided as an infusible biologic therapy for replacement of alpha-1 antitrypsin and administered in outpatient infusion centers or hospital outpatient departments; this billing code identifies the drug product and unit dose for clinical documentation and claims submission.

For related coverage guidance, see recent payer policy updates: Epithelial Cell Cytology in Breast Cancer Risk Assessment, Chimeric Antigen Receptor (CAR) T-Cell Therapy, Antibody-Drug Conjugates.