M23
⚠ Non-billable
Internal derangement of knee
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M23
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes1 — never code together
- ankylosis (M24.66)
- deformity of knee (M21.-)
- osteochondritis dissecans (M93.2)
Excludes2 — not included here, but may code together
- 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)
Frequently asked questions
What is ICD-10 code M23?
ICD-10-CM code M23 represents Internal derangement of knee. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M23 billable?
No. M23 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is M23 in?
M23 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.
Related codes in the M23 category
M23.0
Cystic meniscus
Non-billable
M23.2
Derangement of meniscus due to old tear or injury
Non-billable
M23.00
Cystic meniscus, unspecified meniscus
Non-billable
M23.01
Cystic meniscus, anterior horn of medial meniscus
Non-billable
M23.02
Cystic meniscus, posterior horn of medial meniscus
Non-billable
M23.03
Cystic meniscus, other medial meniscus
Non-billable
M23.04
Cystic meniscus, anterior horn of lateral meniscus
Non-billable
M23.05
Cystic meniscus, posterior horn of lateral meniscus
Non-billable
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