As the name implies, a short-term health insurance policy offers coverage for a period of less than 12 months (e.g., many offer coverage for just 6 months) and are renewable at the option of the insurance company. Though you may be given an opportunity to request to renew the policy, if you’ve made claims since you bought it, the insurer can refuse to renew it. This is also called a non-guaranteed-renewable policy. Short-term policies are not considered minimum essential coverage. Insurance companies that sell such policies are required to notify you that they do not constitute minimum essential coverage.
Related: Should I Buy a Short-Term Policy?