Model laws are recommendations. The NAIC's best-known output is its library of model laws and model regulations. The NAIC describes a model law as "a proposed statutory framework developed and adopted by state insurance regulators through the NAIC's process," and is explicit about its force: "Model laws are not federal law or binding on states; each state determines whether and how to adopt them." A model regulation supplies more detailed rules for carrying out a law, and neither "automatically applies in any state." In practice a state legislature may enact a model law, a state insurance department may adopt a model regulation, either may modify the text, and some states do nothing.
Reading a citation. When a page on this site, an insurer or a news story cites an NAIC model, three questions follow. Which version? Models are amended, and the date NAIC adopted one says nothing about when any state enacted it. Has your state adopted it? And in what form? The answers are in your state's own statute or regulation, which is the law that applies.
What else it does. The NAIC describes its work as including "consumer protection and education, data collection and analysis, technology, financial assessments and reporting, and licensing and testing." It sets the statutory accounting principles insurers use for their financial statements to regulators, runs training and accreditation programs for regulators, and maintains shared databases. For consumers, its website offers a glossary of insurance terms, information on filing a complaint with a state insurance department, a Consumer Insurance Search tool and a Life Insurance Policy Locator for finding a deceased person's policies.
How it relates to the federal government. Insurance is regulated mainly by the states, and the NAIC is the forum through which they coordinate. It is not part of the federal government, and its models are not federal regulations, even where a federal program or statute refers to them.