ICD-10-CM > M00-M99 > M20-M25 > M25 > M25.3 > M25.37 M25.37 Other instability, ankle and foot Non-Billable/Non-Specific Codes M25.371Other instability, right ankleM25.372Other instability, left ankleM25.373Other instability, unspecified ankleM25.374Other instability, right footM25.375Other instability, left footM25.376Other instability, unspecified foot