FHIR R4 Symptoms Implementation Guide, published by HL7 International / Clinical Interoperability Council. This guide is not an authorized publication; it is the continuous build for version 1.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-symptoms-ig/ and changes regularly. See the Directory of published versions

Updating vs. Creating a New Symptom Record

When a symptom recurs, the existing symptom record SHOULD be updated to reflect the patient's current clinical status rather than creating a separate entry. Retaining the same resource identifier preserves the longitudinal story of the symptom over time, while allowing clinically meaningful details to be revised — including whether the symptom is currently active, when it restarted, current severity, frequency or pattern, and any associated factors or triggers. Patient-reported impact and any response to treatment since the prior assessment should also be documented, along with a brief note explaining what has changed clinically. This approach ensures clinicians can view the most current assessment of the symptom while still having access to its full prior course.

A new symptom record is warranted, however, when the recurrence represents a clinically distinct episode rather than a continuation of the same symptom history. Specifically, a new record SHOULD be created when: the symptom has been fully resolved for a significant period and returns in a clearly separate episode; when the new presentation involves a different anatomical location, etiology, or clinical character that distinguishes it meaningfully from the prior occurrence; or when the symptom was previously recorded as resolved or entered-in-error and the new occurrence is best understood as a separate clinical event. In these cases, creating a new record — with its own identifier and onset — more accurately reflects the patient's clinical history and supports clearer longitudinal tracking. The prior record may be cross-referenced using the associatedSymptomsOrConditions extension or related linkage elements to preserve the relationship between episodes where clinically relevant.

In summary, the guiding principle is whether the recurrence represents the same ongoing clinical phenomenon (update the record) or a new, distinct clinical event (create a new record). Implementers should apply clinical judgment in making this determination.