The correct answer is otospongiosis.
The ICD-10-CM stands for International Classification of Diseases -10th Revision-Clinical Modification.
Otospongiosis or Otosclerosis refers to an unusual development of bone close to the middle ear. It can lead to hearing loss. The term otosclerosis is something of a misleading term. The clinical course is signified by lucent rather than sclerotic bony modifications. Hence, it is also called as otospongiosis.