I didn't have any problems. I took me a few weeks to get my insurance updated as I had to change my name with my employer, which took a week as hey made me fill out a new I9 and W4, which required me to wait for my new Social Security card to arrive. Then, they notified my insurer who had to update their records and generate a new card. In the mean time, I had lab tests and an endo visit. They used my old name as that was what was on my insurance card and I didn't have any problems.