Millions of American workers could discover that they no longer have employer-provided health insurance as ObamaCare is phased in. That's because employers are quickly discovering that it may be cheaper to pay fines to the government than to insure workers.

AT&T, Caterpillar, John Deere and Verizon have all made internal calculations, according the House Energy and Commerce Committee, to determine how much could be saved by a) dropping their employer-provided insurance, b) paying a fine of $2,000 per employee, and c) leaving...