It depends on how long since diagnosis, is it mild or severe, any medication being taken, occupation, etc. Assurity might be able to issue a policy, but it really depends on those factors.
There are some markets for this and it does depend upon a number of factors. Assurity has been mentioned. You can also try RISK and Petersen International Underwriters.
Check with your local DI brokerage first as they may have access to these carriers all at the same time.