In most states, the new federal health benefits package standards have had little effect on the commercial health insurance market.
Sabrina Corlette and other Georgetown University health policy researchers have published that finding in a report distributed by the Urban Institute.
The researchers wrote the report to show how five states -- Alabama, Colorado, New Mexico, Oregon and Virginia -- are responding to the Patient Protection and Affordable Care Act essential health benefits package requirements.
The provisions call for all nongrandfathered individual and small-group plans to offer a standardized package of minimum benefits starting Jan. 1.
The EHB benefits list includes some benefits most individual and small-group major medical plans already offer, including coverage for outpatient care, emergency services, hospital care, laboratory services and preventive care services.
The package also includes benefits left out of some low-priced individual policies but usually included in small-group policies: prescription drug coverage, maternity and neonatal care, and mental health services.
In one state, Virginia, regulators did report a major market change, but they also reported a significant expansion of benefits for individual policyholders, researchers said.
All but one of the five states studied had to add both pediatric dental and vision benefits to meet the standard.
Only three of the states had to add standards for habilitative services -- rehabilitation-like services provided for individuals born without certain abilities, such as the ability to walk or talk.
But PPACA and federal regulators did not set a definition for habilitative services, and some states have not come up with definitions, either, the researchers said.
"Some of our insurer respondents indicated they would just 'copy what we have on the physical therapy side' to comply with the requirement to cover habilitative services," the researchers said.