M99.40
ICD-10-CMThis code signifies a narrowing of the neural canal within the head region due to abnormal connective tissue. This stenosis can compress neural structures, potentially leading to neurological symptoms. It describes an anatomical abnormality rather than a specific disease process.
Apply this code when documentation explicitly states "connective tissue stenosis of the neural canal of the head" or similar phrasing. This diagnosis is typically made based on imaging studies (e.g., MRI, CT scans) demonstrating the narrowing and its cause.
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