Hi - I may be mistaken, but as an elementary teacher, I believe early intervention services are for children with developmental delays, speech problems, mental/physical handicaps. CF does not cause any of these problems so I don't know how that would qualify. I do know that once CF children are of school age they can seek a 504 plan. Items addressed in the plan can include enzyme distribution, later start time due to morning therapy, bus service, tutoring during/after hospital stays etc.
I am not sure if this plan is called 504 in every state, but I'm sure every state has a similar plan. Speak to your local public school.
Good luck!
Maria (mother of three daughters, the youngest, Samantha, w/cf)