ICD-10 Code H74.91 – Unspecified disorder of right middle ear and mastoid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H74.91 – Unspecified disorder of right middle ear and mastoid
What it is
H74.91 identifies an unspecified disorder affecting the right middle ear and mastoid. Use it when the documentation confirms a right-sided ear or mastoid problem but does not name a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include right ear pain, hearing change, fullness, drainage, or mastoid tenderness, but the record must support the nonspecific middle ear or mastoid disorder.
When to use this code
Use this code when the provider documents a disorder of the right middle ear or mastoid and gives no further detail. It is appropriate when the chart is laterality-specific but otherwise nonspecific. If a more exact diagnosis is stated, code that instead.
Do not use for
Do not use H74.91 for left-sided, bilateral, or unspecified-ear conditions. Also avoid it when documentation supports a defined diagnosis such as otitis media, mastoiditis, or another specific middle ear disorder.
Coding tip
Check the note for laterality and a named diagnosis; if the condition is specific, H74.91 is not the best choice.