While disclosure isn't required, it is in a woman's best interests to provide her healthcare providers with the most accurate information she can in order to receive appropriate treatment. You will have to give some explanation of how the injuries occurred. Most patients who try to substitute a story will leave out important aspects of the injury. Doctors, especially emergency room doctors, are knowledgable about the ways bruises and fractures associated with beatings are different than those caused by accidents. In many cases, the doctor will suspect that you have been beaten anyway and will ask you.
Emergency departments are well-versed in domestic violence.
They will encourage you to report it to the police, but they won't push. They know better than anyone about the real-life pitfalls, dangers, and limitations of reporting domestic violence and leaving the abuser. If you tell them everything, they will give you referrals to resources to help you cope with the situation in ways that you are willing to do today. They are more likely to photograph injuries for use in any future legal proceeding, should you choose to pursue that. And the abuse will be documented.