Major issue as health care providers, insurers and payers reorganize themselves. When Sherman Act enacted in 1890, interpreted as not applying to insurance. McCarren Ferguson Act allocates power between state and federal government and provides that where states regulate, the federal antitrust laws do not apply to business of insuranhce. Ensure solvency - perhaps greatest threat to state regulation today. Protect consumers against excessive rates.
Regulators can also disprove policy forms or provisiosns if inequitable or excessive.
Often mandate benefits.