ICD-10-CM > M00-M99 > M20-M25 > M25 > M25.4 > M25.47 M25.47 Effusion, ankle and foot Non-Billable/Non-Specific Codes M25.471Effusion, right ankleM25.472Effusion, left ankleM25.473Effusion, unspecified ankleM25.474Effusion, right footM25.475Effusion, left footM25.476Effusion, unspecified foot