Look Up Doctor NPI Numbers:

https://nppes.cms.hhs.gov/NPPES/NPIRegistryHome.do

Look Up NDC Numbers (Needed For Certain Drug Billing), NPI Numbers, Etc.:

http://www.hipaaspace.com/Medical_Billing/Coding/Billing_Code_Lookup_Services.aspx

Centers for Medicare & Medicaid, Government Web Site:

http://www.cms.gov/

NYS Medicaid Web Site:

https://www.emedny.org/

Free Online ICD-9 Codes:

http://www.flashcode.com/