Callosity is a thickening /hyperkeratosis of the skin (overlying the bony region) , due to intermittent pressure effect and friction episodes. It is otherwise known as clavus of the skin( dermatological lesion).
Exostosis is like bossing of the bone more or like a bony sequestrum but with some histological difference and deposits of lipid material on to it.
The excision of the callus could be reported from the Integumentary Category -like 11055-11057 with modifier-59.
The exostosis /bossing excision is like partial excision(craterization, saucerization /sequestrectomy) and may be reported with 2812x series ; in your can be appropriated with 28124. (as the first listed CPT code)
[there is a term callosity or callous formation with respect to the bone , but it is not pathological; it is a physiological healing process in the bone during fracture healing. We should not misinterpret it to this callus of your case]
I hope it gives you some clues
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