The guidance, which is the first to focus on young people, sets out the GMC's expectations and will help doctors make decisions that are in the best interests of children and young people.
The guidance states that GPs must involve young people in discussions about their care and take their views seriously.
GPs should also consider factors including the child's or parents' cultural and religious beliefs. They should provide information to children about their condition and treatment.
The GMC adds that GPs should respect the confidence of children and young people and be aware the same duties of confidentiality apply as with adults.
GMC president Professor Sir Graeme Catto said: 'We hope the new guidance will remind doctors of their ongoing duty to make an effort to communicate with all their firstname.lastname@example.org