I am disabled by mental illness. Can mental illness serve as the basis for a Social Security disability claim?

Yes. To qualify for social security, you have to have a severe, medically determinable impairment that has lasted or is expected to last at least one year. If you have a mental health condition, such as depression, anxiety, PTSD, a bipolar condition, and it is supported by medical evidence, such as going to the doctor, psychiatric records, and those records show that it is so severe that it keeps you from being able to do work activity, then yes, you do qualify for those types of benefits. Moreover, I have found that, in our experience, about half of our claims involve mental health issues, so it is a substantial part of our practice.