ICD-10-CM > H60-H95 > H65-H75 > H74 > H74.9 H74.9 Unspecified disorder of middle ear and mastoid Non-Billable/Non-Specific Codes H74.90Unspecified disorder of middle ear and mastoid, unspecified earH74.91Unspecified disorder of right middle ear and mastoidH74.92Unspecified disorder of left middle ear and mastoidH74.93Unspecified disorder of middle ear and mastoid, bilateral