In this subchapter, "health benefit plan" means a plan that provides benefits for medical, surgical, or other treatment expenses incurred as a result of a health condition, a mental health condition, an accident, sickness, or substance abuse, including an individual, group, blanket, or franchise insurance policy or insurance agreement, a group hospital service contract, or an individual or group evidence of coverage or similar coverage document. The term includes:
Tex. Ins. Code § 544.451