The key is a comprehensive medical chart and report. Sometimes people have to utilize other headings, since we often have many of the criteria for psychiatric or other disability. Your doctor must have a detailed medical record for you. Not only your medical signs and symptoms but adaptive reactions, physical limits and dysfunctions. You must be incapable of performing ANY work, although there is some flexibility in this rule if you are over age 50.
Most work requires regular attendance, the ability to concentrate and follow instructions, etc.
Now the patient can sit a maximum of 20 minutes, cannot concentrate because of medications and pain, and is always exhausted because of lack of sleep. Patient is irritable, argumentative and misses appointments. Measured lifting is now to 3 lb. If the medical notes on your chart are vague, forget benefits. You are orchestrating your medical team.