ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.9 > M65.91 M65.91 Unspecified synovitis and tenosynovitis, shoulder Non-Billable/Non-Specific Codes M65.911Unspecified synovitis and tenosynovitis, right shoulderM65.912Unspecified synovitis and tenosynovitis, left shoulderM65.919Unspecified synovitis and tenosynovitis, unspecified shoulder