ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.9 > M21.92 M21.92 Unspecified acquired deformity of upper arm Non-Billable/Non-Specific Codes M21.921Unspecified acquired deformity of right upper armM21.922Unspecified acquired deformity of left upper armM21.929Unspecified acquired deformity of unspecified upper arm