Hint: Specifics like unilateral, bilateral, and post-traumatic will help you nail this diagnosis. When ICD-9 becomes ICD-10 in 2013, you will not always have a simple crosswalk relationship between old codes and new ones. Often, you'll have more options that may require documentation and coding tweaks. Check out the following example of how ICD-10 will change your coding options when the calendar turns to Oct. 1, 2013. Suppose a patient is diagnosed with osteoarthrosis (715. xx-716. xx). The ICD-9 codes you would list in M1020 or M1022 specify location, primary, or secondary. ICD-10 difference: Once Oct. 1, 2013 rolls around, you should look to: These ICD-10 codes you will list in M1020 or M1022 come 2013 are broken down into location, primary, and secondary like ICD-9 codes, but they also sometimes specify unilateral, bilateral, and posttraumatic indications.