CPT Knowledgebase - Oct 3, 2023

If a patient has pre-existing segmental instrumentation from L2-S1 and undergoes extension of the instrumentation one level to L1 (ie, adding a new L1 screw and removing and replacing the previous L2-S1 rod with a new longer rod extending from L1-S1), would it be appropriate to report with add-on code 22840 for the additional one level instrumentation at L1-L2 or with add-on code 22842 for the final construct L1-S1?

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