ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.8 > M65.87 M65.87 Other synovitis and tenosynovitis, ankle and foot Non-Billable/Non-Specific Codes M65.871Other synovitis and tenosynovitis, right ankle and footM65.872Other synovitis and tenosynovitis, left ankle and footM65.879Other synovitis and tenosynovitis, unspecified ankle and foot