M23.5 ICD-10-CM Code: Chronic instability of knee
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
M23.5Chronic instability of knee
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where M23.5 sits
- 1
Chapter 13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
- 2
Section
Other joint disorders (M20-M25)
- 3
Category M23
Internal derangement of knee
- 4
Code M23.5
Chronic instability of knee
More specific choices
Codes under M23.5
M23.5 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for M23.5.
Code first
No “code first” instruction is listed for M23.5.
Use additional code
No “use additional code” instruction is listed for M23.5.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for M23.5.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for M23.5.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code M23.5 mean?
M23.5 is the FY 2027 U.S. ICD-10-CM code for “Chronic instability of knee.”
Is M23.5 a billable or specific ICD-10-CM code?
No. M23.5 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is M23.5 located in ICD-10-CM?
M23.5 is listed in Chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99), within Other joint disorders (M20-M25) (M20–M25), under category M23, Internal derangement of knee.
What coding notes are listed for M23.5?
No inclusion terms are listed for M23.5 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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