M23.5
ICD-10Non-billable categoryChronic instability of knee
Official ICD-10-CM descriptor (FY2026)
Chronic instability of knee
M23.5 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
ICD-10-CM FY2026 defines 3 codes beneath M23.5. See the ICD-10-CM index for what this site publishes.
Related codes in M23
- M23.0Cystic meniscuscategory
- M23.2Derangement of meniscus due to old tear or injurycategory
- M23.3Other meniscus derangementscategory
- M23.4Loose body in kneecategory
- M23.6Other spontaneous disruption of ligament(s) of kneecategory
- M23.8Other internal derangements of kneecategory
- M23.9Unspecified internal derangement of kneecategory
Where this code sits
- Parent code
- M23
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.