This value set includes codes based on the following rules:

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/nciVersionOfNDF-RT version 20090310

  Code	Display
  N0000029169	ANTACIDS (VA Drug Class)
  N0000029074	ANTIMICROBIALS (VA Drug Class)
  N0000029171	ANTIULCER AGENTS (VA Drug Class)
  N0000000151	Histamine H2 Antagonists (Mechanism of Action)
  N0000029316	IMMUNE SUPPRESSANTS (VA Drug Class)
  N0000007720	Steroids (Structural Class)

• Include these codes as defined in http://snomed.info/sct version http://snomed.info/sct/731000124108/version/20200901

  Code	Display
  367336001	chemotherapy
  108290001	radiotherapy