ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.6 > M85.66 M85.66 Other cyst of bone, lower leg Non-Billable/Non-Specific Codes M85.661Other cyst of bone, right lower legM85.662Other cyst of bone, left lower legM85.669Other cyst of bone, unspecified lower leg