29 C.F.R. § 2590.715-2712
(a) Prohibition on rescissions.
(2) For purposes of this section, a rescission is a cancellation or discontinuance of coverage that has retroactive effect. For example, a cancellation that treats a policy as void from the time of the individual's or group's enrollment is a rescission. As another example, a cancellation that voids benefits paid up to a year before the cancellation is also a rescission for this purpose. A cancellation or discontinuance of coverage is not a rescission if—
(3) The rules of this paragraph (a) are illustrated by the following examples:
Example 1.(i) Facts. Individual A seeks enrollment in an insured group health plan. The plan terms permit rescission of coverage with respect to an individual if the individual engages in fraud or makes an intentional misrepresentation of a material fact. The plan requires A to complete a questionnaire regarding A's prior medical history, which affects setting the group rate by the health insurance issuer. The questionnaire complies with the other requirements of this part. The questionnaire includes the following question: “Is there anything else relevant to your health that we should know?” A inadvertently fails to list that A visited a psychologist on two occasions, six years previously. A is later diagnosed with breast cancer and seeks benefits under the plan. On or around the same time, the issuer receives information about A's visits to the psychologist, which was not disclosed in the questionnaire. (ii) Conclusion. In this Example 1, the plan cannot rescind A's coverage because A's failure to disclose the visits to the psychologist was inadvertent. Therefore, it was not fraudulent or an intentional misrepresentation of material fact.
Example 2.(i) Facts. An employer sponsors a group health plan that provides coverage for employees who work at least 30 hours per week. Individual B has coverage under the plan as a full-time employee. The employer reassigns B to a part-time position. Under the terms of the plan, B is no longer eligible for coverage. The plan mistakenly continues to provide health coverage, collecting premiums from B and paying claims submitted by B. After a routine audit, the plan discovers that B no longer works at least 30 hours per week. The plan rescinds B's coverage effective as of the date that B changed from a full-time employee to a part-time employee. (ii) Conclusion. In this Example 2, the plan cannot rescind B's coverage because there was no fraud or an intentional misrepresentation of material fact. The plan may cancel coverage for B prospectively, subject to other applicable Federal and State laws.
[80 FR 72263, Nov. 18, 2015]