ICD-10-CM > M00-M99 > M86-M90 > M88 > M88.8 > M88.83 M88.83 Osteitis deformans of forearm Non-Billable/Non-Specific Codes M88.831Osteitis deformans of right forearmM88.832Osteitis deformans of left forearmM88.839Osteitis deformans of unspecified forearm