ICD-10-CM > H60-H95 > H80-H83 > H80 > H80.0 H80.0 Otosclerosis involving oval window, nonobliterative Non-Billable/Non-Specific Codes H80.00Otosclerosis involving oval window, nonobliterative, unspecified earH80.01Otosclerosis involving oval window, nonobliterative, right earH80.02Otosclerosis involving oval window, nonobliterative, left earH80.03Otosclerosis involving oval window, nonobliterative, bilateral