ICD-10 Code H62.42 – Otitis externa in other diseases classified elsewhere, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H62.42 – Otitis externa in other diseases classified elsewhere, left ear
What it is
This code identifies inflammation or infection of the left external ear canal that occurs as a manifestation of another underlying disease. Use it when the otitis externa is documented as secondary to a separate condition.
Clinical signs
Typical findings include ear canal redness, swelling, pain, itching, or discharge affecting the left ear. Clinical features vary; refer to documentation, especially when the record links the condition to another disease.
When to use this code
Assign H62.42 when the provider documents otitis externa in the left ear and states it is due to, or associated with, another classified disease. You should also code the underlying condition when documented. Use the left-ear laterality only if the note clearly supports it.
Do not use for
Do not use this code for primary otitis externa without an underlying disease, or when the side is not documented. Check documentation if the record does not clearly link the ear canal condition to another diagnosis.
Coding tip
Always code the underlying disease first when it is documented as the cause of the left-sided otitis externa.