ICD-10-CM > M00-M99 > M65-M67 > M67 > M67.3 > M67.37 M67.37 Transient synovitis, ankle and foot Non-Billable/Non-Specific Codes M67.371Transient synovitis, right ankle and footM67.372Transient synovitis, left ankle and footM67.379Transient synovitis, unspecified ankle and foot