Why must the medical practitioner adhere to certain ethical standards and codes of conduct?

A medical practitioner must adhere to certain ethical standards and codes of conduct because he/she cannot make decisions based solely on his own judgement because it might be biased or too subjective. Therefore, a practitioner must abide by the code of ethics because it delivers guidance to the practitioner in addressing common ethical questions and it elucidates the duties and responsibilities of the practitioner.

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