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
https://nppes.cms.hhs.gov/NPPES/NPIRegistryHome.do
http://www.hipaaspace.com/Medical_Billing/Coding/Billing_Code_Lookup_Services.aspx
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Please also note that you will need Microsoft Excel in order to use the Profitability Calculator