New Yorkers buying a health plan on the state's new insurance exchange should read the fine print if they're interested in seeing some of the city's top doctors.

Not all are participating in the new plans created by the Affordable Care Act.

As of this week, not one of the plans for sale on New York's health benefit exchange would cover treatment at Memorial Sloan-Kettering Cancer Center, one of the world's largest and most respected cancer hospitals.

Other premier city hospitals are in the networks of only a handful of plans.

The narrower networks are a result of insurers trying to control costs and hospitals being cautious about agreeing to take untested insurance products.

Negotiations between several hospitals and insurers were ongoing and it is possible some networks will grow.