I think it is called "Certificate of Credible Coverage"..just shows the new insurance company that you have not had a lapse of coverage. Your old insurance company will know what you need.

Every policy is different but most will honor this and not force a waiting period.

Deb..caregiver to husband, age 63 at diagnosis, former smoker who quit in 1997.
DIAGNOSIS: 6/26/07 SCC right tonsil/BOT T4N0M0
TREATMENT START: 8/9/07 cisplatin/taxol X 7..IMRT twice daily X 31.5.
TREATMENT END: 10/1/07
PEG OUT: 1/08
PORT OUT: 4/09
FOLLOWUP: Now only annual exams. ALL CLEAR!

Passed away 1/7/17 RIP Bill