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ICD-10-CM 2027

ICD-10 code for Postauricular fistula

H70.81

Postauricular fistula

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Fistula (cutaneous) › postauricular”. Page updated September 29, 2026.

About coding Postauricular fistula

The ICD-10-CM code for Postauricular fistula is H70.81 (Postauricular fistula).

Within H70.8 (other mastoiditis and related conditions), H70.81 is specifically for Postauricular fistula. Related codes cover other mastoiditis and related conditions (H70.89).

To report this condition, pick the subcode that matches the documentation: H70.811 (right ear), H70.812 (left ear), H70.813 (bilateral) and H70.819 (unspecified ear).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about Postauricular fistula ICD-10 codes

What is the ICD-10 code for Postauricular fistula?

H70.81 — Postauricular fistula (a header code; report a more specific subcode).

Is H70.81 billable?

No. H70.81 is a header code. Report one of its more specific subcodes instead.