• Include these codes as defined in http://terminology.hl7.org/CodeSystem/v3-ActRelationshipType version 3.1.0

  Code	Display	Definition
  RSON	has reason	**Description:** The reason or rationale for a service. A reason link is weaker than a trigger, it only suggests that some service may be or might have been a reason for some action, but not that this reason requires/required the action to be taken. Also, as opposed to the trigger, there is no strong timely relation between the reason and the action. As well as providing various types of information about the rationale for a service, the RSON act relationship is routinely used between a SBADM act and an OBS act to describe the indication for use of a medication. Child concepts may be used to describe types of indication. *Discussion:* In prior releases, the code "SUGG" (suggests) was expressed as "an inversion of the reason link." That code has been retired in favor of the inversion indicator that is an attribute of ActRelationship.
  BLOCK	blocks	**Definition:** The source act is performed to block the effects of the target act. This act relationship should be used when describing near miss type incidents where potential harm could have occurred, but the action described in the source act blocked the potential harmful effects of the incident actually occurring.
  DIAG	diagnoses	**Description:** The source act is intended to help establish the presence of a (an adverse) situation described by the target act. This is not limited to diseases but can apply to any adverse situation or condition of medical or technical nature.
  IMM	immunization against	**Description:** The source act is intented to provide immunity against the effects of the target act (the target act describes an infectious disease)
  ACTIMM	active immunization against	**Description:** The source act is intended to provide active immunity against the effects of the target act (the target act describes an infectious disease)
  PASSIMM	passive immunization against	**Description:** The source act is intended to provide passive immunity against the effects of the target act (the target act describes an infectious disease).
  MITGT	mitigates	The source act removes or lessens the occurrence or effect of the target act.
  RCVY	recovers	**Definition:** The source act is performed to recover from the effects of the target act.
  PRYLX	prophylaxis of	**Description:** The source act is intended to reduce the risk of of an adverse situation to emerge as described by the target act. This is not limited to diseases but can apply to any adverse situation or condition of medical or technical nature.
  TREAT	treats	**Description:** The source act is intended to improve a pre-existing adverse situation described by the target act. This is not limited to diseases but can apply to any adverse situation or condition of medical or technical nature.
  ADJUNCT	adjunctive treatment	**Description:** The source act is intended to offer an additional treatment for the management or cure of a pre-existing adverse situation described by the target act. This is not limited to diseases but can apply to any adverse situation or condition of medical or technical nature. It is not a requirement that the non-adjunctive treatment is explicitly specified.
  MTREAT	maintenance treatment	**Description:** The source act is intended to provide long term maintenance improvement or management of a pre-existing adverse situation described by the target act. This is not limited to diseases but can apply to any adverse situation or condition of medical or technical nature.
  PALLTREAT	palliates	**Description:** The source act is intended to provide palliation for the effects of the target act.
  SYMP	symptomatic relief	**Description:** The source act is intented to provide symptomatic relief for the effects of the target act.

This value set expansion contains 14 concepts.