M/W 0005
(a) Modifier 0005 (multiple procedures/operations under the same anaesthetic) is not applicable if the following procedures are performed together:
1. Bone graft procedures and instrumentation are to be charged in addition to arthrodesis.
2. When vertebral procedures are performed by arthrodesis, bone grafts and instrumentation may be charged for in addition.
(b) Modifier 0005 (multiple procedures/operations under the same anaesthetic) would be applicable when arthrodesis is performed in addition to another procedure, e.g. osteotomy, laminectomy.