TABLE 1.

Korea Informative Classification of Diseases procedural codes for spinal surgeries with instrumentation in the study

Level	Procedural codes	Procedures
Cervical	N2463, N2462, N2461, N0464	Arthrodesis of spine—cervical spine (anterior technique)
	N0451	Vertebral corpectomy (cervical spine)
	N2469, N2468, N2467	Arthrodesis of spine—cervical spine (posterior technique)
	N2491, N2492	Cervical spine laminoplasty
Thoracic	N2466, N2465, N2464	Arthrodesis of spine—thoracic spine (anterior technique)
	N0452	Vertebral corpectomy (thoracic spine)
	N0468	Arthrodesis of spine—thoracic spine (posterior technique)
Lumbo‐sacral	N0466, N1466	Arthrodesis of spine—lumbar spine (anterior technique)
	N0453	Vertebral corpectomy (lumbar spine)
	N1460, N2470	Posterior lumbar interbody fusion
	N0469, N1469	Arthrodesis of spine—lumbar spine (posterior technique)
Multilevel	N0444, N0445	Arthrodesis for spinal deformity (anterior technique)
	N0446, N0447	Arthrodesis for spinal deformity (posterior technique)
	When procedural codes of two or more sites are registered at the same surgery