ICD-10 Code H70.222 – Chronic petrositis, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.222 – Chronic petrositis, left ear
What it is
This code identifies chronic inflammation or infection involving the petrous portion of the temporal bone on the left side. It is a specific ear and mastoid-related diagnosis, not a general ear infection.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings may include persistent ear pain, otologic drainage, or evidence of chronic infection involving the petrous apex on imaging or specialist exam.
When to use this code
Use H70.222 when the provider documents chronic petrositis affecting the left ear specifically. It is appropriate when the record supports a chronic petrous bone process rather than a nonspecific otitis or mastoid condition. If laterality or chronicity is unclear, check documentation.
Do not use for
Do not use this code for acute petrositis, unspecified ear involvement, or routine middle ear infections. If the documentation does not confirm the left side or chronic nature, choose a more accurate code.
Coding tip
Verify both chronicity and laterality in the provider note before assigning H70.222.