M23.9 (Unspecified internal derangement of knee) is an umbrella ICD-10-CM medical diagnosis code in the Diseases of the musculoskeletal system and connective tissue chapter. It identifies cases of unspecified internal derangement of knee for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

M23.9 — Unspecified internal derangement of knee

Chapter M00-M99: Diseases of the musculoskeletal system and connective tissue

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Sub-codes under M23.9

M23.90Unspecified internal derangement of unspecified kneeM23.91Unspecified internal derangement of right kneeM23.92Unspecified internal derangement of left knee

Related diagnoses

M23.0Cystic meniscusM23.2Derangement of meniscus due to old tear or injuryM23.3Other meniscus derangementsM23.4Loose body in kneeM23.5Chronic instability of kneeM23.6Other spontaneous disruption of ligament(s) of kneeM23.8Other internal derangements of knee

Common questions about M23.9 (Unspecified internal derangement of knee)

What does ICD-10 code M23.9 mean?
M23.9 is the ICD-10-CM 2025 code for Unspecified internal derangement of knee. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is M23.9 a billable diagnosis code?
M23.9 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under M23.9. Browse the sub-codes listed on this page.
Which ICD-10 chapter does M23.9 belong to?
M23.9 belongs to the chapter "Diseases of the musculoskeletal system and connective tissue" (codes M00-M99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Unspecified internal derangement of knee?
For a plain-language explanation of Unspecified internal derangement of knee, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Unspecified internal derangement of knee" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗