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.
Operating systems are computer programs. An operating system is the first piece of software that the computer executes when you turn the machine on. The operating system loads itself into memory and begins managing the resources available on the computer. It then provides those resources to other applications that the user wants to execute.