The code you want to use when billing for exostectomies of the Cuneiforms is 28122:
https://www.aapc.com/memberarea/forums/showthread.php?t=63116
For 1st met Cuneiform exstoectmies it is the same code 28122 the the ICD 9 code should be 726.91
Link to Coding Line explaining:
http://www.podiatrym.com/search3.cfm?id=437
Again the correct code is 28122:
https://www.supercoder.com/my-ask-an-expert/topic/excision-of-metatarsal-cuneiform-exostosis