Respect for autonomy - the patient has the right to refuse or choose their treatment. (Voluntas aegroti suprema lex.)
Beneficence - a practitioner should act in the best interest of the patient. (Salus aegroti suprema lex.)
Non-maleficence - "first, do no harm" (primum non nocere).
Justice - concerns the distribution of scarce health resources, and the decision of who gets what treatment (fairness and equality).
Other values which are sometimes discussed include:
Respect for persons - the patient (and the person treating the patient) have the right to be treated with dignity.
Truthfulness and honesty - the concept of informed consent has increased in importance since the historical events of the Doctors' Trial of the Nuremberg trials and Tuskegee syphilis experiment.