Cigna said it will add $1.2 billion to its reserves.

As a result of the insurance company’s plan to shore up its property/casualty reserves, Cigna will report an $853-million loss for all of 1985. Operating income in 1985 would otherwise have been about $347 million, the nation’s fourth-largest diversified financial-services company said. The company said its reserves have been depleted by burgeoning insurance claims. Insurers maintain reserves to protect themselves against unforeseen claims.