M65.99 Unspecified synovitis and tenosynovitis, multiple sites

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.

Diagnosis Index entries for M65.99

• Synovitis › multiple sites, unspecified type

Nearby codes

• M65.97 Unspecified synovitis and tenosynovitis, ankle and foot
• M65.971 Unspecified synovitis and tenosynovitis, right ankle and foot
• M65.972 Unspecified synovitis and tenosynovitis, left ankle and foot
• M65.979 Unspecified synovitis and tenosynovitis, unspecified ankle and foot
• M65.98 Unspecified synovitis and tenosynovitis, other site
• M65.99 Unspecified synovitis and tenosynovitis, multiple sites (this code)