ICD-10-CM > M00-M99 > M86-M90 > M90 > M90.6 > M90.63 M90.63 Osteitis deformans in neoplastic diseases, forearm Non-Billable/Non-Specific Codes M90.631Osteitis deformans in neoplastic diseases, right forearmM90.632Osteitis deformans in neoplastic diseases, left forearmM90.639Osteitis deformans in neoplastic diseases, unspecified forearm