ICD-10-CM > M00-M99 > M86-M90 > M89 > M89.3 > M89.37 M89.37 Hypertrophy of bone, ankle and foot Non-Billable/Non-Specific Codes M89.371Hypertrophy of bone, right ankle and footM89.372Hypertrophy of bone, left ankle and footM89.379Hypertrophy of bone, unspecified ankle and foot