ICD-10-CM > M00-M99 > M60-M63 > M61 > M61.5 > M61.57 M61.57 Other ossification of muscle, ankle and foot Non-Billable/Non-Specific Codes M61.571Other ossification of muscle, right ankle and footM61.572Other ossification of muscle, left ankle and footM61.579Other ossification of muscle, unspecified ankle and foot