ICD-9 delivers a host of codes you may choose to never use. "There are some interesting ICD-9 2010 codes for mistakes added to E codes," notes Barbara J. Cobuzzi, MBA, CPC, CENTC, CPC-H, CPC-P, CPC-I, CHCC, president of CRN Healthcare Solutions in Tinton Falls, N.J. Before using these codes, beware of these pitfalls. List E Code(s) Last What are E codes? You should use them to describe external causes of injuries or accidents. You should never bill E codes as your primary code, and you should always list the E codes last. It may be necessary to assign more than one E code to fully explain each cause. Report These Codes, Increase Risks In ICD-9-CM 2010, you could solve the abovementioned surgical mishap dilemma with two codes: • E876.6 -- Performance of operation (procedure) on patient not scheduled for surgery • E876.7 -- Performance of correct operation (procedure) on wrong side/body part. Warning: Check out some of the other "wrong" entries listed in the 2010 ICD-9-CM Alphabetic Index: • For a wrong device implanted into correct surgical site, see E876.5 (Performance of wrong operation [procedure] on correct patient). You'd use the same code if the wrong procedure (operation) is performed on the correct patient. • If a doctor performs an operation (procedure) on the wrong patient, you'd instead look to E876.6. • For performing the correct operation (procedure), but on the wrong body part, side, or site, the alphabetic index directs you to E876.7.