CPT Knowledgebase - Jan 7, 2008

What is the appropriate code to report if anterior instrumentation is inserted at vertebral segments C3-4 and additional instrumentation is inserted at C6-7, but vertebral segments C4-5 and C5-6 are not fused? Are the anterior instrumentation codes assigned strictly by the TOTAL number of spinal segments with instrumentation applied (ie, 22846) or is the appropriate code chosen based on the vertebral segments involved in each separate construct (ie, 22845, 22845 59)?

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