This variable is the health care provider taxonomy (HCPT) code used to indicate the billing provider's specialty. This is a unique identifier for a classification of health care specialty at a specialized level of defined medical activity within a medical field as created by the National Uniform Claim Committee (NUCC).
Taxonomy codes are assigned by the National Uniform Claims Committee (NUCC). For a current list of NUCC Provider Taxonomy Codes and Descriptions see the Code Sets link at http://www.nucc.org/index.php/code-sets-mainmenu-41/provider-taxonomymainmenu-40.
Source: Medicare Advantage Organizations (MAOs)