Oth disrd of l mid ear and mastoid in diseases classd elswhr

This code describes various specified conditions affecting the left middle ear and mastoid process that are secondary manifestations of another underlying disease process. These disorders are not primarily ear conditions but rather complications or features of a systemic or other localized disease.

Use this code when documentation clearly indicates a specific, non-otologic disease is causing a disorder of the left middle ear or mastoid, and the specific ear disorder is not separately classifiable. Examples include otitis media secondary to a systemic autoimmune disease or mastoiditis as a complication of a distant infection. The underlying disease must be coded first.

• Always sequence the underlying systemic disease code first, as this code indicates a manifestation "in diseases classified elsewhere."
• Ensure the documentation specifies "left" middle ear and mastoid; otherwise, consider codes for unspecified or bilateral involvement.
• Avoid using this code if a more specific code exists for the particular middle ear or mastoid disorder, even if it's secondary to another disease.