Most insurance plans let kids remain on their parents' policies while they're in college.
Pelosi says the provision in the House bill would help those who are out of school, looking for work or are part-time employees.
The provision is based on Rep. Kathy Dahlkemper's legislation. Dahlkemper says 31 percent of people ages 19 to 29 don't have health care coverage.
The Pennsylvania Democrat says there is "a clear and urgent need" to cover young adults.
The Congressional Budget Office has not assessed how much the provision would cost.