ICD-10 Code Translator Tool: https://www.aapc.com/icd-10/codes/
CMS Code lookup: https://www.cms.gov/medicare-coverage-database/staticpages/icd-10-code-lookup.aspx
CMS-Road to 10: http://www.roadto10.org/quick-references/
ICD-10 Data: http://www.icd10data.com/