Diagnosis Code for Reimbursement Claim: ICD-9-CM 879.8. Code will be replaced by October 2015 and relabeled as ICD-10-CM 879.8. The Short Description Is: Open wound site NOS.
operating system. noun. Definition of operating system for Students. : a program or series of programs that controls the operation of a computer and directs the processing of the user's programs.
An operating system (OS) is the main program on a computer. It performs a variety of functions, including. 1  determining what types of software you can install. 2  coordinating the applications running on the computer at any given time.