Colin Campbell has Lou Gehrig’s disease and Medicare coverage because of his disability, but no fewer than 14 home health care providers have told him he can’t use it to pay for their services. That’s an incorrect but common belief.

An annual panel discussion called “Life Over 90,” is aimed at nudging students toward choosing geriatric medicine, the primary care field that focuses on the elderly. It is among the lowest-paid specialties, and geriatricians must contend with complex cases that are time consuming and are often not reimbursed adequately by Medicare or private insurance.