ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.4 > M85.47 M85.47 Solitary bone cyst, ankle and foot Non-Billable/Non-Specific Codes M85.471Solitary bone cyst, right ankle and footM85.472Solitary bone cyst, left ankle and footM85.479Solitary bone cyst, unspecified ankle and foot