ICD-10-CM > H60-H95 > H65-H75 > H68 > H68.1 > H68.12 H68.12 Intrinsic cartilagenous obstruction of Eustachian tube Non-Billable/Non-Specific Codes H68.121Intrinsic cartilagenous obstruction of Eustachian tube, right earH68.122Intrinsic cartilagenous obstruction of Eustachian tube, left earH68.123Intrinsic cartilagenous obstruction of Eustachian tube, bilateralH68.129Intrinsic cartilagenous obstruction of Eustachian tube, unspecified ear