Most disability programs have 3 forms that need to be completed as part of the initial application. The claimant, the employer and the treating doctor each fill out a form.
The form from the employer will ask for information about your job. The employer should provide a very detailed job description, which itemizes the essential tasks or duties of your position, even if one is not required by the form.
Your doctor may only have a limited knowledge of your employment and not know the essential tasks of your job. The detailed job description should be shared with your treating doctor before he/she completes the medical questionnaire. It is important for the doctor to outline how your physical and / or cognitive limitations interfere with your ability to perform these tasks.
If your doctor simply indicates what your diagnosis is and does not outline how your medical condition prevents you from performing the essential tasks or duties of your position, it is unlikely that your application will be accepted.