ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.4 > M85.42 M85.42 Solitary bone cyst, humerus Non-Billable/Non-Specific Codes M85.421Solitary bone cyst, right humerusM85.422Solitary bone cyst, left humerusM85.429Solitary bone cyst, unspecified humerus