Americans should be “extraordinarily worried” over the projected rising costs of healthcare under Obamacare, renowned pediatric neurosurgeon Dr. Benjamin Carson said on Wednesday.

“This was something that was supposed to bring the cost of healthcare down — and, of course, it’s had exactly the opposite effect,” Carson, who is retiring this summer as director of pediatric neurosurgery at the Johns Hopkins University in Baltimore, told Neil Cavuto on Fox News.

“The average family that has private insurance has already seen about a $2,500 increase, and there’s no reason to expect that that’s not going to continue to go up.

“As the insurance companies are penalized, they’re simply going to pass on the costs to consumers,” Carson added. “We can look for a long upward spiraling of costs.”

Recent studies have shown that Obamacare, formally known as the Affordable Care Act, may not be affordable for many low-wage workers, including those at large chain restaurants, retail stores, and hotels.

Because of a wrinkle in the law, companies can meet their legal obligations by offering policies that would be too expensive for many low-wage workers, The Associated Press reports.

The company can get off the hook, corporate consultants and policy experts told the AP, but the employee might still be required by federal law to get health insurance or else risk fines.