Texas Insurance Code - INS § 463.052. Required Participation in Association

(a) As a condition of engaging in the business of insurance in this state, an insurer, including a mutual assessment company, a local mutual aid association, a statewide mutual assessment company, a stipulated premium company, and a health maintenance organization authorized to engage in business in this state, shall participate as a member of the association if the insurer holds a certificate of authority to engage in a kind of insurance business in this state with respect to which this chapter provides coverage as determined under Subchapter E.  1  The requirement to participate applies regardless of whether the insurer's certificate of authority in this state is suspended, revoked, not renewed, or voluntarily withdrawn.

(b) The following do not participate as member insurers: