M65.921 Unspecified synovitis and tenosynovitis, right upper arm

Billable ICD-10-CM code, FY2026.

Applies from M65 Synovitis and tenosynovitis

Excludes1 (never code together)

• chronic crepitant synovitis of hand and wrist (M70.0-)
• current injury - see injury of ligament or tendon by body region
• soft tissue disorders related to use, overuse and pressure (M70.-)

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Nearby codes

• M65.91 Unspecified synovitis and tenosynovitis, shoulder
• M65.911 Unspecified synovitis and tenosynovitis, right shoulder
• M65.912 Unspecified synovitis and tenosynovitis, left shoulder
• M65.919 Unspecified synovitis and tenosynovitis, unspecified shoulder
• M65.92 Unspecified synovitis and tenosynovitis, upper arm
• M65.921 Unspecified synovitis and tenosynovitis, right upper arm (this code)
• M65.922 Unspecified synovitis and tenosynovitis, left upper arm
• M65.929 Unspecified synovitis and tenosynovitis, unspecified upper arm
• M65.93 Unspecified synovitis and tenosynovitis, forearm
• M65.931 Unspecified synovitis and tenosynovitis, right forearm
• M65.932 Unspecified synovitis and tenosynovitis, left forearm