Yes! “Regular class attendance is expected of all students at the University.” (Student Code 1-501)
“Instructors are strongly encouraged to make a course syllabus available to all students prior to the deadline for an undergraduate student to add a course (see the Office of the Registrar Academic Calendars (http://registrar.illinois.edu/academic-calendars) for the current term for the specific date). A syllabus should include the instructor’s course attendance policy, the due dates of all major assignments, quizzes, and examinations.” (Student Code 1-501)
“The instructor decides when a student’s attendance becomes irregular. In this case, the instructor may send oral, written, or electronic notice of the student’s irregular attendance to the dean of the student’s college. The dean shall then notify the student in writing, with a copy to the instructor." "If, after receiving a notice described in subsection (h) above, a student’s attendance continues to be irregular, the instructor may report this fact to the student’s college dean. The dean of the student’s college, in consultation with the instructor, may determine that the student’s attendance has become so irregular that the student’s scholarship is likely to be severely impaired. The dean may require the student to withdraw from the course with a grade of Withdrawal or Failure.” (Student Code 1-501)
The most important thing to do is to notify your instructor as soon as possible that you will be absent. Then you can work with them to make up the work that will be missed or turn the work in early.
A student may notify the Student Assistance Center in the Office of the Dean of Students if the student will be unavoidably absent from class because of illness, death in the family, or other emergency for three days or more.
If you will miss multiple classes or have an extended absence, see the requirements for obtaining an absence letter from the Student Assistance Center in the Office of the Dean of Students. Students should request absence letters as soon as possible after the student’s return from the absence, but no later than 10 business days after the student’s return to class.
“Undergraduate students must obtain the approval of the dean of their college to defer a final examination. Undergraduate students who must miss a scheduled examination should report this fact to the dean of their college as soon as possible and before the examination period. For satisfactory reasons, students may be “excused” by the dean of their college and examined later by their instructor. Absence from a final examination for any other cause is reported as a final grade of “absent” (ABS) in the course and counts as a failure.” (Student Code 3-201)
See the complete Class Attendance Policy in the Student Code.