ICD-10 Code H70.092 – Acute mastoiditis with other complications, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.092 – Acute mastoiditis with other complications, left ear
What it is
This code identifies acute infection and inflammation of the mastoid air cells in the left ear, with complications other than those separately specified by another code. Use it when the record clearly documents left-sided acute mastoiditis and an additional complication.
Clinical signs
Typical findings include ear pain, fever, swelling or tenderness behind the ear, and signs of middle ear infection. Clinical features vary; refer to documentation for the specific complication and laterality.
When to use this code
Use H70.092 when the provider documents acute mastoiditis affecting the left ear and notes another complication, such as extension beyond the mastoid or another described adverse finding. Confirm that the documentation supports both acuity and the left-sided site before coding.
Do not use for
Do not use this code for chronic mastoiditis, unspecified mastoiditis, or right-ear disease. If the complication is not documented or is described differently, check documentation.
Coding tip
Verify the exact complication and laterality in the note, because H70.092 is specific to acute left mastoiditis with other complications.