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ICD-10 CM Code H70.81

H70 Mastoiditis and related conditions
H70.8 Other mastoiditis and related conditions

H70.81 Postauricular fistula

H70.811 Postauricular fistula, right ear
H70.812 Postauricular fistula, left ear
H70.813 Postauricular fistula, bilateral
H70.819 Postauricular fistula, unspecified ear

Excludes Type 1

preauricular sinus and cyst (Q18.1)
sinus, fistula, and cyst of branchial cleft (Q18.0)

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