SACRAMENTO, Calif. (AP) - Swan Lockett had high hopes that President Barack Obama's health overhaul would lead her family to an affordable insurance plan, but that hasn't happened.
Instead, the 46-year-old mother of four from Texas uses home remedies or pays $75 to see a doctor when she has an asthma attack.
"If I don't have the money, I just let it go on its own," Lockett said.
The federal health care overhaul has provided coverage for millions of Americans, but it has only chipped away at one of its core goals: to sharply reduce the number of people without insurance.
President Barack Obama announced last week that 8 million people have signed up for coverage through new insurance exchanges, but barriers continue to prevent millions of people around the nation from accessing care.
Questions of affordability, eligibility, immigrant access and the response from employers and state legislatures - obstacles that existed before the Affordable Care Act took effect - mean considerable work lies ahead.
There are myriad reasons why people remain uncovered. Some are eligible for discounted policies but say they still can't afford their share of exchange plans. Others earn too much for subsidies. Immigrants living in the country illegally are blocked from obtaining care under the law. Dozens of states haven't expanded Medicaid. And some employers have reduced staff hours to avoid being mandated to provide care.
Before the launch of the Affordable Care Act, about 48 million people, or 15 percent of the population, went without health insurance, according to the U.S. Census Bureau. The number of people recently enrolled includes those who switched from previous plans, and it's not clear how many previously uninsured people are now covered.
The share of adults without insurance shrank from 17.1 percent at the end of last year to 15.6 percent for the first three months of 2014, according to a Gallup-Healthways Well-Being Index released this month. The decline would translate to about 3.5 million people gaining coverage, according to the study.
Health advocates say their work isn't finished. California "has made huge progress with the new benefits of the Affordable Care Act," said Anthony Wright, executive director of Health Access California. "But there's more to do."
For individuals in need of care, high premiums, co-pays and deductibles present challenges that often can't be overcome.
Hair salon owner Lola Smith of Palo Alto, in eastern Pennsylvania coal country, said she couldn't afford a policy from the federal exchange. Instead, she bought a cut-rate plan for $148 a month that helps pay for hospitalizations and doctor visits.
"It doesn't cover very much. It's just basic," she said.
The scant coverage doesn't qualify as health insurance under Affordable Care Act regulations, and Smith expects to be hit with a fine for going without insurance until she qualifies for Medicare next year.
Immigrants living in the U.S. illegally are ineligible for coverage under the law. The Migration Policy Institute estimates that more than 7.5 million people fall into this category and rely on emergency rooms and safety net clinics. About 1 million members of this population are from California.
"When I see there are American citizens who don't have access to health care because they can't pay for it, I figure that I'll have even less of a chance to have access to health services," said Jose Diaz, a 67-year-old day laborer in Pomona, Calif., who came to the U.S. illegally from Mexico City nearly a decade ago. "It's very sad."
Another issue is a coverage gap. Nearly 5 million low-income, childless adults are without health care, according to a December survey by Kaiser Family Foundation.
A Medicaid expansion could help close that gap, and the federal government has offered to pay states nearly all of the costs for covering individuals who earn up to $16,000 a year, 138 percent of the federal poverty wage.
However, 24 states have opted against it, saying they don't trust the federal government to deliver on its promises and don't want to be stuck with a program they can't afford.
Texas is among that group, and Lockett says that's keeping her shut out.
The Houston woman says she earns too much for Medicaid or a subsidy but can't afford a full plan. Lockett earns $1,225 a month. She takes her four children - a 5-year-old daughter, 18-year-old twin boys and a 19-year-old son - to the emergency room or a community clinic when the need care.
An asthma attack two months ago cost her $75, which she says is a noticeable chunk of her monthly income.
"I was disappointed," Lockett said, "because I was kind of excited about getting on the Affordable Care Act on the marketplace."