M23.4
⚠ Non-billable
Loose body in knee
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M23.4
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.
Frequently asked questions
What is ICD-10 code M23.4?
ICD-10-CM code M23.4 represents Loose body in 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 M23.4 billable?
No. M23.4 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is M23.4 in?
M23.4 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
Internal derangement of knee
Non-billable
M23.0
Cystic meniscus
Non-billable
M23.2
Derangement of meniscus due to old tear or injury
Non-billable
M23.3
Other meniscus derangements
Non-billable
M23.5
Chronic instability of knee
Non-billable
M23.6
Other spontaneous disruption of ligament(s) of knee
Non-billable
M23.8
Other internal derangements of knee
Non-billable
M23.9
Unspecified internal derangement of knee
Non-billable
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