Postauricular fistula, bilateral

This code describes an abnormal, usually epithelial-lined, tract that connects the skin surface behind both ears to an underlying structure or cavity. This congenital or acquired condition can lead to recurrent infections, drainage, or discomfort in the postauricular region.

Use this code when documentation specifies a postauricular fistula affecting both ears. This typically involves a persistent opening or tract located posterior to the auricle, often with a history of discharge or inflammation. Documentation should clearly indicate the bilateral nature of the fistula.

• Ensure documentation explicitly states "bilateral" to support the use of this specific code.
• Distinguish from preauricular fistulas (Q18.1), which are located anterior to the ear.
• Code any associated infections (e.g., L03.211, L03.212) or complications separately.