If an employee has a HIPAA special enrollment event (marriage, birth, adoption) is the company required to allow that employee the option of switching between different levels of coverage or is the company simply required to allow that employee the option of adding/deleting dependents from his current level of coverage?

I'm not sure about HIPAA, but our insurance provider always told us the change must be consistent with the qualifying event - therefore someone enrolled in the health plan who got married could add their spouse and any dependents OR they could drop coverage.