ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.9 > M65.93 M65.93 Unspecified synovitis and tenosynovitis, forearm Non-Billable/Non-Specific Codes M65.931Unspecified synovitis and tenosynovitis, right forearmM65.932Unspecified synovitis and tenosynovitis, left forearmM65.939Unspecified synovitis and tenosynovitis, unspecified forearm