Criminal conspiracy to defraud the State of Wisconsin. These notes were given out fraudulently with the intended purpose of having these teachers submit them in order to get paid sick pay on a day when their pay should have been docked for unexcused absence.
If any of these teachers submitted the notes to their employer, then they could lose their teaching license and go to jail for felony conspiracy to commit fraud and larceny.
The doctors are accessories before the fact and are also guilty of criminal conspiracy. In most states a conspiracy to commit a misdemeanor is a felony. So even if the larceny does not rise to the level of a felony, the conspiracy between the doctor and the teacher brings the crime up to the level of a felony.