Coding of a nonunion arthrodesis of C6 and C7

Im new to coding orthopedic cases. I have a patient who presents with neck pain, and xray reveals a failure of union of arthrodesis between C6 and C7. Please advise as to how I code this...

Thanks,
Karen

Apr 30th, 2014 -

re: Coding of a nonunion arthrodesis of C6 and C7

Does anyone have an answer for me... thanks so much.