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Centers for Diseases Control and Prevention

CMS
Centers for Medicare & Medicaid Services

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ICD-10-CM update
http://www.cdc.gov/nchs/icd/icd10cm.htm

ICD-10-PCS update
http://www.cms.hhs.gov/ICD10

ICD-10-CM Official Coding Guidelines
http://www.cdc.gov/nchs/icd/icd10cm.htm

ICD-10-PCS Official Coding Guidelines
http://www.cms.gov/ICD10/11b15_2012_ICD10PCS.asp#TopOfPage

2012 ICD-10-PCS Tables and Index