M65.859 Other synovitis and tenosynovitis, unspecified thigh

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.

Approximate ICD-9-CM (GEMs)

• 727.09 Other synovitis and tenosynovitis (approximate)

Nearby codes

• M65.842 Other synovitis and tenosynovitis, left hand
• M65.849 Other synovitis and tenosynovitis, unspecified hand
• M65.85 Other synovitis and tenosynovitis, thigh
• M65.851 Other synovitis and tenosynovitis, right thigh
• M65.852 Other synovitis and tenosynovitis, left thigh
• M65.859 Other synovitis and tenosynovitis, unspecified thigh (this code)
• M65.86 Other synovitis and tenosynovitis, lower leg
• M65.861 Other synovitis and tenosynovitis, right lower leg
• M65.862 Other synovitis and tenosynovitis, left lower leg
• M65.869 Other synovitis and tenosynovitis, unspecified lower leg
• M65.87 Other synovitis and tenosynovitis, ankle and foot