Div 1 manual approximately page 135 in my own words
14.2.3.1 any competition regardless of time shall be counted as a season of completion
14.2.4Hardship Waiver student athlete may be granted an additional year for "hardship" for injury or illness if it occurs prior to the completion of the first half of the championship season or the injury or illness occurs when the student athlete has not participated in more than 3 contests (or dates) or 30% (whichever is greater).
There is also rules about if the injury occurs in the fall, etc.
There is no such thing as a medical redshirt, the term redshirt just means that you have been granted one more year of eligibility, regardless of the reason. I was trying to show the difference between the reasons for the extra year of eligibilty awarded, for not playing or for a hardhsip waiver.
After a day at work and speaking to about 125 per day, the mind gets burned by 5pm.
The cost would be in bandwidth.
Natefun, I realized that you are a player and the manual is difficult, hope that this helps.
While people post questions to find out answers, sometimes it is helpful to try a search first, which is really not too difficult for an adult. The question was about a cut off date. I would think that a coach should inform a player prior to season he would be redshirted. But I have seen where a player sits all season on the bench gets one or two at bat or innings and the year is blown.
ncaa.org