The ICD-9-CM Expert for Hospitals, Volumes 1, 2 & 3, is Ingenix's premier facility ICD-9-CM resource that is as smart and dependable as the coders who use it. With critical coding and reimbursement edit alerts on the same page as the code you want, you'll be able to code with increased precision and efficiency. Plus, you'll receive email updates throughout the year informing you of crucial changes to the ICD-9-CM code set, including any April 1 changes, should there be any.