Question: New York Subscriber Answer: Coders report individual Medicaid carriers requiring them to use 2007 codes as late as April and June of 2008. Other lucky coders note that they're able to start reporting 2008 codes to Medicaid without denials. What to do: Unless your payer tells you otherwise in writing, begin using updated ICD-9 codes Oct. 1. If you receive denials for the updated codes, contact your carrier and verify which code set it requires you to use. If the carrier wants you to report last year's codes, ask for this instruction in writing, including the date that you should begin using the updated codes.