Businesses hate uncertainty. So many were heartened that the Supreme Court ruling Thursday, largely upholding the national health care law, provided a measure of clarity in their health care calculations -- though aspects of the clearer picture weren’t entirely welcomed.

Massachusetts employers and health care companies said their companies would not be dramatically changed by the federal Accountable Care Act because the state already mandates so-called universal coverage. Other parts of the federal law that remain intact -- requirements to cover those with pre-existing medical conditions and not cancel coverage after people get sick -- also are already in force in Massachusetts.