Can a 15 year old go to doctor without parent?

It depends on the country and specific state or region. In some jurisdictions, minors have the right to seek medical care without parental consent for certain types of services, such as reproductive health care or treatment for sexually transmitted infections. However, parental consent is generally required for minors to receive most other types of medical care. It's always best to check with a local healthcare provider or legal expert to determine the specific requirements in your area.