WASHINGTON (CBSMiami) – As the Supreme Court prepares to release its long awaited decision on the constitutionality of the Affordable Care Act; the nation’s largest insurer isn’t waiting to announce it will keep at least two key provisions of the health care reform law.

UnitedHealthcare announced Monday it will keep in place rules allowing adults up to 26 years old to remain on their parents’ health care plans and would end lifetime dollar limits on insurance, regardless of the Supreme Court’s ultimate decision.

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The high court is expected to rule as early as this week on the law and can uphold the law in its entirety, overturn parts of the law, or completely overturn the entire bill.

UnitedHealthcare said it would also continue to offer policyholders no-copayment preventive services and third-party appeals if a treatment is denied, according to National Public Radio.

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However, United didn’t indicate if they would accept all children regardless of pre-existing medical conditions. It’s expected that if the entire law is overturned, insurers would be able once again to reject consumers on the basis of pre-existing medical conditions.

United also didn’t say if the law is overturned if it would continue with a plan enacted under the law saying health insurers must give rebates to customers if 80 percent of their premiums aren’t spent on medical care.

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Update: 4:04 p.m. – Aetna and Humana have followed UnitedHealthcare’s lead, according to the liberal website, ThinkProgress.com.