AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2024 Issue 1; Ask the Editor

Admission Following Chimeric Antigen Receptor T-Cell Immunotherapy

A patient with mantle cell lymphoma presented to the outpatient clinic for administration of chimeric antigen receptor (CAR) T-cell immunotherapy. After the infusion was completed, the patient was admitted, per protocol, for close monitoring. Is it appropriate to assign code Z51.12, Encounter for antineoplastic immunotherapy, as the principal diagnosis when the CAR T-cell therapy was administered before admission, or is the lymphoma listed first? What is the principal diagnosis in this case, where inpatient admission was ordered for continued care following outpatient CAR T-cell infusion? ...

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