Supplemental Health Insurance, or Supplementary insurance, is meant to supplement your plan and is not ObamaCare compliant on it’s own. Supplementary insurance is sold by private companies to alleviate some or all of your health care costs that the plan doesn’t cover, like copayments, coinsurance, and deductibles.
For example, the silver plan is most popular at 70/30. Meaning the company pays 70% and you pay 30%. With the supplement insurance, it could cover the total 30% and you may have additional funds to use for other important obligations.