All Democratic bills include additional subsidies and financial aid for low-income families and individuals who are not able to afford insurance, and analysts say the overall effect will depend on the effectiveness of those measures.
The Senate committees and House Democrats are proposing to provide subsidies to those individuals and families whose incomes are up to 400 percent of the federal poverty level. For a family of four, that was gauged at $22,050 for 2009. There are also provisions for tax breaks for small businesses and expansion of Medicaid.
Another controversial measure that would impact a small, albeit important, group of Americans is a tax on high-value "Cadillac" plans, generous insurance packages that include luxuries such as no co-payments and deductibles and that some critics say are a big source of costs for the insurance industry.
Under Baucus' plan, insurers would pay tax on plans for which premiums exceed $8,000 for individual coverage and $21,000 for family coverage, starting in 2013.
Most Americans oppose such a tax, with 61 percent in the ABC News/Washington Post saying it should not be imposed.
Most Americans aren't covered by such plans. In 2009, the annual premiums for employer-sponsored health insurance averaged $4,824 for single coverage and $13,375 for family coverage, according to the Kaiser Family Foundation's 2009 Employer Health Benefits survey.
Some Democrats and most Republicans in Congress also oppose this measure.
GOP leaders say taxing insurance providers means taxing people because companies will simply pass on their new costs to people in the form of higher co-payments and deductibles. Some Democrats oppose the plan because of their union supporters, who fear it will impinge on their often generous benefits packages, which they take in exchange for lower pay.
ABC News' Z. Byron Wolf contributed to this report.