ICD-10-CM > M00-M99 > M86-M90 > M89 > M89.7 > M89.73 M89.73 Major osseous defect, forearm Non-Billable/Non-Specific Applicable To Major osseous defect of radius and ulna Codes M89.731Major osseous defect, right forearmM89.732Major osseous defect, left forearmM89.739Major osseous defect, unspecified forearm