If someone is going through a divorce can the wife be kept on her exs medical insurance?

Yes, until the divorce is final. After that, if she's healthy she can get a PRIVATE policy. In CA click here for pricing, benefits and online applications If not, and it's an Employer Plan she would be eligible for COBRA after than she can get HIPAA for definitions of who is elible to be covered see If it's an individual plan - just ask the company to split her off.