ICD-10 Code H70.81 – Postauricular fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.81 – Postauricular fistula
What it is
H70.81 identifies a fistula behind the ear, in the postauricular area. Use it when the record documents an abnormal tract or opening in that location.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include a persistent draining opening, localized swelling, or recurrent irritation behind the ear.
When to use this code
Use this code when the clinician documents a postauricular fistula as the diagnosis, such as a chronic sinus tract behind the ear. It may also fit postoperative or congenital descriptions if the note clearly names the fistula. Check documentation for laterality or associated ear disease.
Do not use for
Do not use this code for simple skin infection, abscess, or nonspecific drainage without a documented fistula. If the record describes a different ear condition, code that condition instead.
Coding tip
Code only when the provider explicitly documents a fistula; otherwise, query or check documentation.