ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.9 > M65.97 M65.97 Unspecified synovitis and tenosynovitis, ankle and foot Non-Billable/Non-Specific Codes M65.971Unspecified synovitis and tenosynovitis, right ankle and footM65.972Unspecified synovitis and tenosynovitis, left ankle and footM65.979Unspecified synovitis and tenosynovitis, unspecified ankle and foot