T24.42 - Corrosion of unspecified degree of knee T24.4 - Corrosion of unspecified degree of lower limb, except ankle and foot T24.42 - Corrosion of unspecified degree of knee T24.421 - Corrosion of unspecified degree of right knee T24.422 - Corrosion of unspecified degree of left knee T24.429 - Corrosion of unspecified degree of unspecified knee