M23.4 Loose body in knee

Non-billable header with 3 child codes.

Applies from M23 Internal derangement of knee

Excludes1 (never code together)

• ankylosis (M24.66)
• deformity of knee (M21.-)
• osteochondritis dissecans (M93.2)

Excludes2 (not included here)

• current injury - see injury of knee and lower leg (S80-S89)
• recurrent dislocation or subluxation of joints (M24.4)
• recurrent dislocation or subluxation of patella (M22.0-M22.1)

Codes under M23.4

• M23.40 Loose body in knee, unspecified knee
• M23.41 Loose body in knee, right knee
• M23.42 Loose body in knee, left knee

Code annotations containing back-references to M23.4

Back-references to M23.4

• Type 2 Excludes: M24.0 Loose body in joint ("loose body in knee (M23.4)")

Back-references to M23

• Type 2 Excludes: M24.1 Other articular cartilage disorders ("internal derangement of knee (M23.-)")
• Type 2 Excludes: S83 Dislocation and sprain of joints and ligaments of knee ("internal derangement of knee (M23.-)")

Diagnosis Index entries for M23.4

• Body, bodies › loose › joint, except knee › knee
• Body, bodies › rice › knee
• Derangement › knee (recurrent) › loose body
• Joint › mice › knee
• Loose › body › joint › knee
• Loose › body › knee
• Mice, joint › knee
• Mouse, joint › knee
• Rice bodies › knee

Nearby codes

• M23.359 Other meniscus derangements, posterior horn of lateral meniscus, unspecified knee
• M23.36 Other meniscus derangements, other lateral meniscus
• M23.361 Other meniscus derangements, other lateral meniscus, right knee
• M23.362 Other meniscus derangements, other lateral meniscus, left knee
• M23.369 Other meniscus derangements, other lateral meniscus, unspecified knee
• M23.4 Loose body in knee (this code)
• M23.40 Loose body in knee, unspecified knee
• M23.41 Loose body in knee, right knee
• M23.42 Loose body in knee, left knee
• M23.5 Chronic instability of knee
• M23.50 Chronic instability of knee, unspecified knee