The employer may request that the employee obtain a second or third opinion medical certification at the employer's expense if there is a dispute between the employee's healthcare provider and the employer's designated healthcare provider regarding the employee's ability to perform their essential job functions or the need for leave. The employer must provide written notice to the employee of its request for a second or third opinion and the reasons for the request. The employee must provide the second or third opinion certification within 15 calendar days of the employer's request.