ICD-10 Code H75 – Other disorders of middle ear and mastoid in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H75 – Other disorders of middle ear and mastoid in diseases classified elsewhere
What it is
H75 identifies middle ear or mastoid disorders that are caused by another underlying disease. Use it when the ear condition is documented as secondary, not as a primary ear disease.
Clinical signs
Clinical features vary; refer to documentation. You may see signs of middle ear or mastoid involvement, but the record should link them to the underlying condition causing the disorder.
When to use this code
Use H75 when the clinician documents a middle ear or mastoid disorder “in diseases classified elsewhere” and names the causal condition. It fits secondary ear involvement, not an isolated otologic diagnosis. If the cause or site is unclear, check documentation before coding.
Do not use for
Do not use H75 for primary ear infections, trauma, or nonspecific ear symptoms without a documented underlying disease. Check documentation if the chart does not clearly state a secondary disorder.
Coding tip
Always code the underlying disease first when supported, and assign H75 only when the record explicitly links the ear disorder to that condition.