ICD-10 Code H74.9 – Unspecified disorder of middle ear and mastoid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H74.9 – Unspecified disorder of middle ear and mastoid
What it is
H74.9 identifies a disorder affecting the middle ear or mastoid when the record does not specify the exact condition. Use it for nonspecific pathology involving these structures, not for a defined diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart may note ear pain, hearing changes, drainage, or abnormal otoscopic findings, but the specific disorder is not named.
When to use this code
Use H74.9 when the provider documents a middle ear or mastoid disorder without further detail and no more specific code is supported. It is appropriate when the diagnosis is incomplete, unclear, or recorded as unspecified. Check documentation before assigning it if the note suggests a named condition.
Do not use for
Do not use this code when the record identifies a specific middle ear or mastoid disorder, such as a distinct inflammatory, structural, or postprocedural condition. Also avoid it if the documentation only supports symptoms without a diagnosed disorder.
Coding tip
Query for clarification when the provider’s note names the ear region but not the exact disorder.