ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.5 > M85.52 M85.52 Aneurysmal bone cyst, upper arm Non-Billable/Non-Specific Codes M85.521Aneurysmal bone cyst, right upper armM85.522Aneurysmal bone cyst, left upper armM85.529Aneurysmal bone cyst, unspecified upper arm