As Obama administration officials put into place some of the new rules that go into effect under the federal health care law, they are issuing more waivers to try to prevent some insurers and employers from dropping coverage and also promising to modify other rules because many of the existing policies would not meet new standards.

Last month, federal officials granted dozens of one-year waivers that were aimed at sparing certain employers, including McDonald’s, insurers and unions who offer plans that sharply limit the coverage they provide. These limited-benefit plans, also known as “minimeds,” fail to comply with new rules phasing out limits on how much policies will provide in medical care each year.

Concerned about the potential disruption that would be created by enforcing the new rules, the administration has granted dozens of additional waivers and also made clear that it would modify other rules affecting these policies. Last week, the Department of Health and Human Services issued more guidance, saying it would use a different method of calculating spending for these plans so they would be able to meet new regulations dictating how insurers should use the premium dollars they collect.

While critics say these moves could water down the new law, the administration says it is responding to concerns from employers and others that many workers have no other alternative. The new rules also require that the policies clearly say how much coverage they provide and that they do not satisfy the law’s new standards.