AAPC American Academy of Professional Coders
http://www.aapc.com

AHIMA American Health Information Management Association
http://www.ahima.org

Blue Cross/Blue Shield Association
http://www.bluecares.com

CCI
http://cms.hhs.gov/physicians/cciedits/default.asp

CMS
General: http://www.cms.hhs.gov
Medicare Learning Network: http://www.cms.hhs.gov/mlngeninfo
Online Medicare manuals: http://www.cms.hhs.gov/Manuals/IOM/list.asp
Medicare Physician Fee Schedule: http://www.cms.hhs.gov/PhysicianFeeSched/

HCPCS
General: http://www.cms.hhs.gov/MedHCPCSGenInfo
Annual alphanumeric Healthcare Common Procedure Coding System file: http://www.cms.hhs.gov/HCPCSReleaseCodeSets

HIPAA
Home page: http://www.cms.hhs.gov/hipaa/hipaa2/
Questions and Answers on HIPAA Privacy Policies: http://answers.hhs.gov
Office of Civil Rights Privacy Fact Sheets: http://www.hhs.gov/ocr/hipaa

ICD
NCHS (National Center for Health Statistics) posts the ICD-9-CM addenda and guidelines: http://www.cdc.gov/nchs/datawh/ftpserv/ftpicd9/ftpicd9.htm#guidelines

NUBC (CMS 1450/UB-04)
http://www.nubc.org

NUCC (CMS 1500)
http://www.nucc.org

State Insurance Commissioners
http://www.omc.state.ct.us