Dr Duncombe has been working as a GP on the Northside of Brisbane for 27 years, with her practice in Stafford City Family Medical Practice combining with The Grange Central Medical Practice to become Stafford City Doctors in January 2012.

Dr Duncombe has a strong interest in the treatment and management of obesity and the follow-up of surgical treatments such a Gastric Banding and Gastric bypass with particular interests in Lap Band adjustments and review.