ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.2 > M21.27 M21.27 Flexion deformity, ankle and toes Non-Billable/Non-Specific Codes M21.271Flexion deformity, right ankle and toesM21.272Flexion deformity, left ankle and toesM21.279Flexion deformity, unspecified ankle and toes