I don't know anything about price controls, but the phenomenon of employers offering health insurance was simply a means of circumventing the wage freeze. If raises and bonuses were temporarily outlawed, what could you give your employees? Benefits. Health insurance just became the substitute for a raise or bonus.
You know, people are always asking about how we in the USA got into our unusual predicament of health insurance being tied to employment... an equally interesting question to me, and one which I've never seen discussed, is how did the nations which offer nationalized health insurance get into their situation? At one time in the USA, medical care was available only under the fee-for-service model. This must have been the case at one time in Western European nations too. How and when did they make the switch, and why did they go straight from free-market directly to completely-socialized?