Medical Billing/Compliance

Bureau of National Affairs Health Care Fraud http://www.bna.com/prodcatalog/desc/HFRA.html

Health Care Financing Administration (HCFA) http://www.hcfa.gov/

Medical Group Management Association (MGMA) http://www.mgma.com/

Central Office on ICD-9-CM http://www.icd-9-cm.org