ICD-10 Code H70.221 – Chronic petrositis, right ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.221 – Chronic petrositis, right ear
What it is
H70.221 identifies chronic inflammation or infection of the petrous part of the temporal bone in the right ear. Use it when the record specifically documents chronic petrositis on the right side.
Clinical signs
Clinical features vary; refer to documentation. Records may note persistent ear pain, drainage, hearing changes, or complications from chronic mastoid or temporal bone infection.
When to use this code
Use this code when the clinician documents chronic petrositis affecting the right ear, including follow-up care for a known chronic condition. You should code it only when the laterality and chronic nature are clearly stated. Check documentation if the note mentions petrous bone involvement without specifying the right side.
Do not use for
Do not use this code for acute petrositis, unspecified ear laterality, or general otitis without petrous bone involvement. Check documentation if the diagnosis is only suspected.
Coding tip
Confirm both chronicity and right-sided laterality in the provider’s note before assigning H70.221.