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

Adding-On Phenomenon Following Scoliosis Correction Surgery

A 17-year-old patient with a history of thoracic adolescent idiopathic scoliosis (AIS) has developed adding-on phenomenon following a previous T2-T12 posterior spinal fusion. The patient has developed progression of the lumbar curvature over the past year and now presents for a posterior spinal fusion of T2-L3 for correction of the adding-on phenomenon. What is the correct ICD-10-CM code assignment for “adding-on phenomenon” that occurred following previous spinal fusion for scoliosis correction? ...

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