M23.309 Other meniscus derangements, unspecified meniscus, unspecified knee

Billable ICD-10-CM code, FY2026.

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)

Applies from M23.3 Other meniscus derangements

Applicable to

• Degenerate meniscus
• Detached meniscus
• Retained meniscus

Applies from M23.30 Other meniscus derangements, unspecified meniscus

Applicable to

• Other meniscus derangements, unspecified lateral meniscus
• Other meniscus derangements, unspecified medial meniscus

MS-DRG index

Defines the logic of DRG(s) 562-563 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 717.5 Derangement of meniscus, not elsewhere classified (approximate)

Code annotations containing back-references to M23.309

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.-)")

Nearby codes

• M23.303 Other meniscus derangements, unspecified medial meniscus, right knee
• M23.304 Other meniscus derangements, unspecified medial meniscus, left knee
• M23.305 Other meniscus derangements, unspecified medial meniscus, unspecified knee
• M23.306 Other meniscus derangements, unspecified meniscus, right knee
• M23.307 Other meniscus derangements, unspecified meniscus, left knee
• M23.309 Other meniscus derangements, unspecified meniscus, unspecified knee (this code)
• M23.31 Other meniscus derangements, anterior horn of medial meniscus
• M23.311 Other meniscus derangements, anterior horn of medial meniscus, right knee
• M23.312 Other meniscus derangements, anterior horn of medial meniscus, left knee
• M23.319 Other meniscus derangements, anterior horn of medial meniscus, unspecified knee
• M23.32 Other meniscus derangements, posterior horn of medial meniscus