What Is a Guarantor on a Medical Form?
According to WellSpan Health, the guarantor is the person legally responsible for charges incurred. A person over the age of 18 is typically listed as her own guarantor.
An adult over the age of 18 may not be listed as her own guarantor if she is a college student and remains under her parents' health insurance plan or if she is mentally or physically disabled and not competent to cover her own medical expenses. A person under the age of 18 may be her own guarantor if she is legally emancipated or if she has a child in her own custody.