A national provider identifier (NPI) is a unique ten-digit identification number required by HIPAA for all health care providers in the United States.
Generally, the law in New Hampshire is that child support ends when the child turns 18 or graduates from high school, whichever is later. Yet, the answer to the question is not that simple. Sometimes, there may be a circumstance which can extend child support, for example if your child is disabled.
Child support, without an agreement or court order, usually ends at the child's eighteenth birthday, although it will continue beyond then if the child is still in high school, so long as the child is not over twenty years old.