ICD-10-CM > M00-M99 > M86-M90 > M90 > M90.6 > M90.66 M90.66 Osteitis deformans in neoplastic diseases, lower leg Non-Billable/Non-Specific Codes M90.661Osteitis deformans in neoplastic diseases, right lower legM90.662Osteitis deformans in neoplastic diseases, left lower legM90.669Osteitis deformans in neoplastic diseases, unspecified lower leg