ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.4 > M85.46 M85.46 Solitary bone cyst, tibia and fibula Non-Billable/Non-Specific Codes M85.461Solitary bone cyst, right tibia and fibulaM85.462Solitary bone cyst, left tibia and fibulaM85.469Solitary bone cyst, unspecified tibia and fibula