Prohibits downcoding in health insurance claims.

S 594 prohibits health insurance payers in New Jersey from downcoding claims, meaning they cannot adjust claims to a lower-cost service to pay providers less than for the actual service performed. This directly affects healthcare providers who submit claims and insurance payers (including carriers, health maintenance organizations, and their agents) operating in New Jersey. The bill requires payers to reimburse providers for the actual service billed, not a reduced code, and mandates the Department of Banking and Insurance to create implementing regulations. It defines "downcoding" as adjusting claims to less complex services to lower payments, which can significantly reduce provider revenue.