Most health plans seek accreditation from the National Committee of Quality Assurance. NCQA accreditation of health plans can be found through a search on
www.ncqa.org. It can be found by a search on "health plan report card". The site doesn't tell you anything about employment, but it does speak to whether or not the health plan meets standards of quality in health care. NCQA accreditation might be a good talking point during your interview. Best of luck to you both.
Linda