ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.8 > M65.82 M65.82 Other synovitis and tenosynovitis, upper arm Non-Billable/Non-Specific Codes M65.821Other synovitis and tenosynovitis, right upper armM65.822Other synovitis and tenosynovitis, left upper armM65.829Other synovitis and tenosynovitis, unspecified upper arm