ICD-10 Code H70.093 – Acute mastoiditis with other complications, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.093 – Acute mastoiditis with other complications, bilateral
What it is
This code identifies an acute infection of both mastoid processes, with complications other than the standard categories. It means the mastoid air cells behind each ear are inflamed and the record documents additional complications.
Clinical signs
Typical findings include ear pain, fever, swelling or tenderness behind the ears, and signs of middle ear infection. Clinical features vary; refer to documentation for the specific complication and bilateral involvement.
When to use this code
Use H70.093 when the provider documents acute mastoiditis affecting both sides and notes another complication that is not separately specified by a more exact mastoiditis code. You should rely on the chart wording for laterality and complication details. If the record only says mastoiditis without complications, check documentation.
Do not use for
Do not use this code for unilateral mastoiditis, chronic mastoiditis, or mastoiditis without documented complications. If the complication is named more specifically, code the more precise option instead.
Coding tip
Verify both bilateral laterality and the presence of an unspecified “other complication” before assigning H70.093.