ICD-10 Code H70.202 – Unspecified Petrositis, Left Ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.202 – Unspecified petrositis, left ear
What it is
H70.202 identifies petrositis affecting the left ear when the documentation does not specify the type or cause. It refers to inflammation or infection of the petrous part of the temporal bone.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include ear pain, persistent infection, headache, or cranial nerve involvement, but you should code only what is documented.
When to use this code
Use this code when the provider documents petrositis in the left ear and does not identify a more specific form. It also fits when the record states “unspecified petrositis” or gives limited detail. Check documentation if the laterality or diagnosis is unclear.
Do not use for
Do not use this code for right ear or bilateral petrositis, or when a more specific petrositis type is documented. If the note describes another mastoid or ear infection instead, code that condition instead.
Coding tip
Confirm left-sided laterality and the word “unspecified” in the record before assigning H70.202.