This case-sensitive code system http://hl7.org/fhir/us/cdmh/CodeSystem/pcornet-race defines the following codes:

Code	Display	Definition
01	American Indian or Alaskan Native	Person's Race is American Indian or Alaskan Native.
02	Asian	Person's Race is Asian.
03	Black or African American	Person's Race is Black or African American.
04	Native Hawaiian or Other Pacific Highlander	Person's Race is Hawaiian or Other Pacific Highlander.
05	White	Person's Race is White.
06	Multiple Race	Person's belongs to multiple race.
07	Refuse to answer	Person refused to identify which race they belong to.
NI	No Information	There is no information about Person's race.
UN	Unknown	Person's race is unknown.
OT	Other	Person's race is Other.