M65.4 Radial styloid tenosynovitis [de Quervain]

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)

• 727.04 Radial styloid tenosynovitis

Diagnosis Index entries for M65.4

• De Quervain's › disease (tendon sheath)
• Disease, diseased › de Quervain's (tendon sheath)
• Quervain's disease
• Tenosynovitis › radial styloid

Nearby codes

• M65.349 Trigger finger, unspecified ring finger
• M65.35 Trigger finger, little finger
• M65.351 Trigger finger, right little finger
• M65.352 Trigger finger, left little finger
• M65.359 Trigger finger, unspecified little finger
• M65.4 Radial styloid tenosynovitis [de Quervain] (this code)
• M65.8 Other synovitis and tenosynovitis
• M65.80 Other synovitis and tenosynovitis, unspecified site
• M65.81 Other synovitis and tenosynovitis, shoulder
• M65.811 Other synovitis and tenosynovitis, right shoulder
• M65.812 Other synovitis and tenosynovitis, left shoulder