ICD-10-CM > Q00-QA0 > Q65-Q79 > Q71 > Q71.5 Q71.5 Longitudinal reduction defect of ulna Non-Billable/Non-Specific Codes Q71.50Longitudinal reduction defect of unspecified ulnaQ71.51Longitudinal reduction defect of right ulnaQ71.52Longitudinal reduction defect of left ulnaQ71.53Longitudinal reduction defect of ulna, bilateral