Osia CPT Code Study

Inclusion Criteria: * Willing and able to provide written informed consent. * Proficient in English. * Hearing loss etiology of Conductive or Mixed Conductive loss. * Bone conduction PTA (.5, 1, 2, and 3 kHz) better than or equal to 55 dB HL in the treatment ear. * Aged 18 years and older. Exclusion Criteria: * Unwilling to wear the treatment device or comply with the surgical and rehabilitation requirements of the study. * Unable or unwilling to comply with the requirements of the clinical investigation as determined by the Investigator. * Medical, audiological or psychological conditions, as judged by the investigator that might contraindicate participation in the clinical investigation. * Investigator site personnel directly affiliated with this study and/or their immediate families; immediate family is defined as a spouse, parent, child, or sibling. * Cochlear employees or contractors engaged by Cochlear for the purposes of this investigation. * Currently participating, or participated within the last 30 days, in another interventional clinical investigation/trial involving an investigational drug or device. * Prior experience with a surgical bone conduction treatment option * Insufficient bone quality to support the BI300 implant as determined by the surgeon