ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.1 > M21.17 M21.17 Varus deformity, not elsewhere classified, ankle Non-Billable/Non-Specific Codes M21.171Varus deformity, not elsewhere classified, right ankleM21.172Varus deformity, not elsewhere classified, left ankleM21.179Varus deformity, not elsewhere classified, unspecified ankle