M65.161 Other infective (teno)synovitis, right knee

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)

Code annotations containing back-references to M65.161

Back-references to M65.1

• Type 1 Excludes: M25.4 Effusion of joint ("other infective (teno)synovitis (M65.1-)")

Nearby codes

• M65.15 Other infective (teno)synovitis, hip
• M65.151 Other infective (teno)synovitis, right hip
• M65.152 Other infective (teno)synovitis, left hip
• M65.159 Other infective (teno)synovitis, unspecified hip
• M65.16 Other infective (teno)synovitis, knee
• M65.161 Other infective (teno)synovitis, right knee (this code)
• M65.162 Other infective (teno)synovitis, left knee
• M65.169 Other infective (teno)synovitis, unspecified knee
• M65.17 Other infective (teno)synovitis, ankle and foot
• M65.171 Other infective (teno)synovitis, right ankle and foot
• M65.172 Other infective (teno)synovitis, left ankle and foot