Eligibilty Classes for health and welfare plans

[Guest Kriesinator]

Health Clinic Employer with 500+ employees: They have a self-funded dental/vision plan. They allow physicians/MDs to enroll after 30 days while all other employees wait 90 days. Benefits are identical... only the entry date is earlier. Concerned that this is discriminatory under 105. Correct?

They also have fully insured plans with the same structure, but these would be exempt because they are fully insured, correct?

Thanks