ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.8 > M65.84 M65.84 Other synovitis and tenosynovitis, hand Non-Billable/Non-Specific Codes M65.841Other synovitis and tenosynovitis, right handM65.842Other synovitis and tenosynovitis, left handM65.849Other synovitis and tenosynovitis, unspecified hand