ICD-10-CM > M00-M99 > M60-M63 > M63 > M63.8 > M63.87 M63.87 Disorders of muscle in diseases classified elsewhere, ankle and foot Non-Billable/Non-Specific Codes M63.871Disorders of muscle in diseases classified elsewhere, right ankle and footM63.872Disorders of muscle in diseases classified elsewhere, left ankle and footM63.879Disorders of muscle in diseases classified elsewhere, unspecified ankle and foot