(a) This subchapter applies to every insurance company, corporation, interinsurance exchange, mutual, reciprocal, association, Lloyd’s plan, or other organization or insurer writing any of the characters of insurance business herein set forth, hereinafter called “Insurer”; provided that nothing in this entire subchapter shall be construed to apply to any county or farm mutual insurance company or association, as regulated under Chapters 911 and 912 of this code, except that:
(1) Article 5.13-2 of this code shall apply to a county mutual insurance company with respect to personal automobile and commercial automobile insurance, residential and commercial property insurance, and inland marine insurance;
(2) Article 5.20 of this code shall apply to a county mutual insurance company with respect to each line of insurance that a county mutual insurance company is authorized to write under Section 912.151; and
(3) Article 5.20 of this code shall apply to a farm mutual insurance company with respect to each line of insurance that a farm mutual insurance company is authorized to write under Section 911.151.
(b) This subchapter applies to the writing of casualty insurance and the writing of fidelity, surety, and guaranty bonds, on risks or operations in this State except as herein stated.

(c) Except as otherwise provided by this subchapter, this subchapter does not apply to the writing of motor vehicle, life, health, accident, professional liability, reinsurance, aircraft, fraternal benefit, fire, lightning, tornado, windstorm, hail, smoke or smudge, cyclone, earthquake, volcanic eruption, rain, frost and freeze, weather or climatic conditions, excess or deficiency of moisture, flood, the rising of the waters of the ocean or its tributaries, bombardment, invasion, insurrection, riot, civil war or commotion, military or usurped power, any order of a civil authority made to prevent the spread of a conflagration, epidemic or catastrophe, vandalism or malicious mischief, strike or lockout, water or other fluid or substance, resulting from the breakage or leakage of sprinklers, pumps, or other apparatus erected for extinguishing fires, water pipes or other conduits or containers, or resulting from casual water entering through leaks or opening in buildings or by seepage through building walls, including insurance against accidental injury of such sprinklers, pumps, fire apparatus, conduits or container, workers’ compensation, noncommercial inland marine, ocean marine, marine, or title insurance; nor does this subchapter apply to the writing of explosion insurance, except insurance against loss from injury to person or property which results accidentally from steam boilers, heaters or pressure vessels, electrical devices, engines and all machinery and appliances used in connection therewith or operation thereby.
(d) This subchapter shall not be construed as limiting in any manner the types or classes of insurance which may be written by the several types of insurers under appropriate statutes or their charters or permits.
(e) The regulatory power herein conferred is vested in the commissioner.