Dr Gradwell died after stepping in front of a train near his home in Poynton in May 2006.
Eastern Cheshire PCT had investigated him after an accusation against him concerning an elderly patient. The complaint was not upheld, but he feared going through a public inquiry.
At the inquest in Warrington, deputy coroner Dr Janet Napier recorded a verdict that Dr Gradwell took his own life while the balance of his mind was disturbed.