Coding - Hospital Admissions and Asthma Codes from Medical Economics

http://www.memag.com/memag/article/articleDetail.jsp?id=312268&ref=25
Q. I discharged a patient from the hospital and had to readmit him the next day. Should I code for the second admission service?
Q. When reporting an asthma diagnosis, do I need a fifth digit?
Topic are covered at the link above.