The purposes of this subchapter are to provide for the circumstances under which, and the constraints within which, a group health benefit plan issuer, an accident and health insurance issuer, or health maintenance organization may:(1) vary benefits, including cost-sharing mechanisms such as a deductible, copayment, or coinsurance, based on whether an individual has met the standards of a wellness program that satisfies the requirements of §§21.4706, 21.4707, or 21.4708 of this title; or(2) vary the amount of premium or contribution it requires similarly situated individuals to pay based on whether an individual has met the standards of a wellness program that satisfies the requirements of §§21.4706, 21.4707, or 21.4708 of this title.