Is it against the law if a doctor does not examine a patient who goes to the ER?

This is not my field of law.

Without adequate details about your reason for a visit to the ER, its hard to answer your question. Generally, an emergency room is only required to stabilize the patient. Once stabilized, the patient may be released to go home, transferred to another location for additional care, or admitted to that hospital if beds are available. If the injury is minimal, another health care provider such as a nurse practitioner may be authorized to provide ER care. A triage center can even refuse to treat someone who has repeatedly abused their service by falsely declaring the need for emergency treatment when there is nothing wrong with the person. There is no obligation to provide a prescription if the patient doesnt need it and ERs are increasingly aware of fraudulent attempts to obtain drugs for illegal purposes.