M23.90
BillableUnspecified internal derangement of unspecified knee
M23.90 is the ICD-10-CM code for Unspecified internal derangement of unspecified knee. It is a billable, specific code valid for reimbursement.
M00-M99 Diseases of the musculoskeletal system and connective tissue
What this means — in plain language
MedlinePlus · NIHYour knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking. Knee problems are very common, and they occur in people of all ages. Knee problems can interfere with many things, from participation in sports to simply getting up from a chair…
Read more about Knee Injuries and Disorders at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Frequently asked questions
- What is ICD-10 code M23.90?
- M23.90 is the ICD-10-CM code for "Unspecified internal derangement of unspecified knee". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
- Is M23.90 a billable code?
- Yes — M23.90 is a billable, specific ICD-10-CM code valid for reimbursement.
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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