ICD-10 Code H70.813 – Postauricular fistula, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H70.813 – Postauricular fistula, bilateral
What it is
H70.813 identifies a bilateral postauricular fistula, meaning abnormal openings or tracts located behind both ears. Use this code when the documentation specifically states postauricular fistula on both sides.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include a visible opening, intermittent drainage, or local irritation behind the ear, but you should code only what is documented.
When to use this code
Use H70.813 when the provider documents a postauricular fistula affecting both ears. It may appear in outpatient, specialty, or surgical records when the condition is confirmed on examination or imaging.
If the note specifies laterality as bilateral, this code is appropriate. Check documentation if the fistula is congenital, acquired, or associated with another ear condition, because coding may depend on the recorded diagnosis.
Do not use for
Do not use this code for a unilateral postauricular fistula or for nonspecific ear drainage without a documented fistula. Do not code based on suspicion alone; check documentation.
Coding tip
Confirm bilateral laterality in the provider note before assigning H70.813.