No Prop (daytrading) firm offers healthcare (that I know off). And I have worked at several shops.
They prefer to take the money your commissions generate and buy benefits for everyone in the back office and management. I always found it ironic that the "traders" whom bring in all of the revenue receive the least amount of benefits (and/or respect in many firms, for that matter.)
Many frims do let you participate in their plans but you have to pay into them same is if you were buying them on your own.
Unforunately we all live by the sword. We get only what we can take from mr. market!
Good luck taking as much as you can b/c we are all on our own!