ICD-11 classes
06 Mental, behavioural or neurodevelopmental disorders
Mood disorders
6A80 — Symptomatic and course presentations for mood episodes in...
6A80.4 — Seasonal pattern of mood episode onset

ICD-11 6A80.4 — Seasonal pattern of mood episode onset

In the context of recurrent depressive disorder, bipolar type I or bipolar type II disorder, there has been a regular seasonal pattern of onset and remission of at least one type of episode (i.e., depressive, manic, mixed, or hypomanic episodes), with a substantial majority of the relevant mood episodes corresponding to the seasonal pattern. (In bipolar type I and bipolar type II disorder, all types of mood episodes may not follow this pattern.) A seasonal pattern should be differentiated from an episode that is coincidental with a particular season but predominantly related to a psychological stressor that regularly occurs at that time of the year (e.g., seasonal unemployment).

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.