====== CVX ======
**CDC Vaccine Administered CVX (NCIRD)** is a coding system for a vaccine substance administered. The codes are used for immunization messages and it is a product of the Centers for Disease Control and Prevention (CDC). CVX includes approximately 200 active and inactive vaccine terms. It also indicates a vaccine’s current availability and the last update time for the vaccine code. Inactive vaccine codes allow users to transmit historical immunization data.

==== Sources ====
All CVX source information is obtained from the following:
  - Centers for Disease Control and Prevention (CDC) Website: The corpus of all CVX codes [[https://www2a.cdc.gov/vaccines/iis/iisstandards/vaccines.asp?rpt=cvx]] 
  - Relationships from CVX Vaccines to CVX Vaccine Groups: [[https://www2a.cdc.gov/vaccines/iis/iisstandards/vaccines.asp?rpt=vg]]
  - The National Library of Medicine (NLM) Website: Relationships from the CVX to the RxNorm (the RXNCONSO table) [[http://www.nlm.nih.gov/research/umls/rxnorm/docs/rxnormfiles.html]]

==== Standard concept ====
  * If a CVX concept has a standard equivalent in "RxNorm", it is considered to be Non-standard.
  * If a CVX concept does not have a standard equivalent in "RxNorm",  it is considered to be Standard.
==== Domain ====
The majority of CVX concepts are in the "Drug" domain. Only “Tuberculin skin test”-related CVX concepts have the domain of ‘Measurement’ 

==== Concept Class ====
All CVX concepts have Concept Class of "CVX".