Counting on version 17.3 will put you behind. If you're used to ignoring new CCI edits for the Hospital Outpatient Prospective Payment Systems (OPPS) because the implementation date lags by a quarter -- don't count on it. Here's why: That means you'll need to code according to CCI version 18.0 for inpatient and outpatient billing starting Jan. 1, or face denials.