ICD-10 Code H70.892 – Other mastoiditis and related conditions, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.892 – Other mastoiditis and related conditions, left ear
What it is
This code identifies mastoid inflammation or a related mastoid condition affecting the left ear when the documentation does not fit a more specific mastoiditis category. Use it for a left-sided diagnosis involving the mastoid process or nearby mastoid structures.
Clinical signs
Typical findings may include ear pain, tenderness behind the ear, swelling, or redness over the mastoid area. Clinical features vary; refer to documentation for the exact left-ear mastoid condition being described.
When to use this code
Use H70.892 when the provider documents other mastoiditis or a related mastoid disorder in the left ear and no more specific code applies. It is appropriate when the record clearly states left-sided involvement. If the note is vague, check documentation before coding.
Do not use for
Do not use this code for right ear, bilateral, or unspecified mastoid conditions. Also avoid it when the documentation supports a more specific mastoiditis diagnosis or a different ear disorder entirely.
Coding tip
Verify laterality and the exact mastoid diagnosis in the chart before assigning H70.892.