Best check your state law (in the US). In many states, one must be a ‘qualified’ patient for it to be legal for a physician to write a DNR order for you. ‘Qualified’ usually means that you have a disease process which is anticipated to be fatal within a relatively short time, such as a year, or that you suffer from a condition such that attempts to resuscitate you would be even more futile than average, or particularly cruel, or would just prolong you in a very painful state.
QtM, author of many DNR orders.