Complete list of ICD-9 codes available online Here is a list of ICD-9-related Web sites. Keep it handy in case you ever have a question or problem with your diagnosis coding. ICD-9 CM Coordination and Maintenance Committee: http://www.cdc.gov/nchs/about/otheract/icd9/maint/maint.htm Information Resource Products: http://www.irp.com/index.htm Official ICD-9-CM coding guidelines: http://www.cdc.gov/nchs/data/icd9/icdguide.pdf List of ICD-9-CM codes: http://www.cms.hhs.gov/medlearn/icd9code.asp