Medication Statement Data Absent Reason
Captures the reason that a patient's medication statement is missing or not recorded.
In detail:
Specifies context and value of a Data Absent Reason (DAR) indicating why information is missing about a patient's medication statement.
When a DAR is specified, this class shall be populated, but Observation shall not.
Conversely, when an actual observation (i.e., with a known value) is specified, the Observation class shall be populated, but this class shall not.
In this class, the DAR code, i.e., the attribute Medication Statement Data Absent Reason Code must always be populated.
If the DAR applies to all medication statements (i.e., for any drug), then DAR Code is populated. All other attributes, which provide context for the DAR, must be left empty.
If the DAR applies to a specific context, i.e., a medication usage reason (e.g., health condition), a medication code, a compounded/custom drug description, an ingredient substance (i.e., DAR for any drug having that substance) or a non-prescription drugs indicator (i.e., DAR as answer to the question of whether or not the patient takes any non-prescription drugs), then the corresponding context attribute(s) must be populated as well, in addition to the DAR Code attribute. The DAR Code (e.g., asked-declined) then applies only to the specified combination of context attribute values.
Since some context attributes are more general than others, the following combination is not valid: Non-Prescribed Medications Indicator together with Medication Code or Compounded Medication Description.
Appears in
Constraints
Unique key(s)
- Patient, Clinical Information Life Cycle Event(Type Code is "assertion").Event Date Time if specified, (*all specified attribute(s) other than Medication Statement Data Absent Reason Code)
- XOR (Non-Prescribed Medications Indicator, OR(Medication Usage Reason Code, XOR(Medication Code, Compounded Medication Description), Medication Ingredient Substance Code)
Stereotype(s)
n/a
Attributes
| Attribute | Type | Multiplicity | Attribute note |
|---|---|---|---|
| Medication Usage Reason Code | Codeable Concept | 0..1 | Uniquely specifies the sign, symptom, or health condition that the medication is or was taken to manage, improve, treat or prevent.
Note: usually identical to the reason(s) on the medication request(s); however, the patient may report (abnormally) medication usage reason(s) different from the one(s) provided by the prescriber.
Value set:
https://fhir.infoway-inforoute.ca/ValueSet/medicationreasoncode
|
| Medication Code | Codeable Concept | 0..1 | Uniquely specifies a medication product.
Value Sets:
Canadian Clinical Drug Data Set (CCDD):
https://fhir.infoway-inforoute.ca/ValueSet/prescriptionmedicinalproduct
Health Canada Drug Identification Number (DIN):
https://health-products.canada.ca/dpd-bdpp/
Health Canada Natural Product Number (NPN):
https://www.canada.ca/en/health-canada/services/drugs-health-products/natural-non-prescription/applications-submissions/product-licensing/licensed-natural-health-products-database.html
Alternate value set: Alternate Pharmaceutical Biologic:
https://fhir.infoway-inforoute.ca/ValueSet/pharmaceuticalbiologicproductandsubstancecode |
| Compounded Medication Description | String | 0..1 | The free text description of a compounded medication, which does not have a standard code (such as a CCDD MP code, a DIN or a natural-health-product NPN). Generally, the relevant information, such as strength and dose, is included in the description. |
| Medication Ingredient Substance Code | Codeable Concept | 0..1 | Uniquely specifies a substance which is an ingredient of the given medication drug product.
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/hc-CCDD/tm |
| Non-Prescribed Medication Indicator | Indicator | 0..1 | Indicates whether or not a drug or drugs the patient is or was or will be taking is non-prescribed medication (e.g., over-the-counter product, traditional medicine).
If true and no corresponding Drug record is documented in this statement (i.e., if there is no known standard drug code for the medication), then non-prescribed medication(s) reported by the patient other than traditional medicines may be documented in the free text part of this attribute. |
| Medication Statement Data Absent Reason Code | Codeable Concept | 1 | Uniquely specifies the reason that a patient's medication statement is missing or not recorded (e.g., asked-declined, not-asked, unknown).
Value Set: http://terminology.hl7.org/CodeSystem/data-absent-reason |
Relationships
| From class | From multiplicity | Relationship | To class | To multiplicity |
|---|---|---|---|---|
| Medication Statement Data Absent Reason | 0..* | documented in | Encounter | 0..1 |
| Medication Statement Data Absent Reason | 0..* | for | Patient | 1 |
| Medication Statement Data Absent Reason | 0..* | has | Clinical Information Life Cycle Event | 0..* |
Contact us
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How to cite:
Canadian Institute for Health Information. Medication Statement Data Absent Reason. Accessed November 02, 2026.
