Nini:
You may want to check out the Federal Register for Dec. 13, 2006, Part 3, Nondiscrimination and Wellness Programs in Health Coverage in the Group Market; Final Rules at
http://edocket.access.gpo.gov/2006/pdf/06-9557.pdf.
On p. 75034, it states under Example 4: "Imposing additional eligibility requirements on former employees is permitted because a classification that distinguishes between current and former employees is a bona-fide employment-based classification that is permitted, provided that it is not directed at individual participants or beneficiaries. It is permissible to distinguish between former employees who satisfy the service requirement and those who do not, provided that the distinction is not directed at individual participants or beneficiaries. However, former employees who do not satisfy the eligibility criteria, may be eligible for continued coverage pursuant to COBRA or similar State law."
Don Levit