| Sub-classification | Description |
| F31.0 | Bipolar affective disorder, current episode hypomanic |
| F31.1 | Bipolar affective disorder, current episode manic without psychotic symptoms |
| F31.2 | Bipolar affective disorder, current episode manic with psychotic symptoms |
| F31.3 | Bipolar affective disorder, current episode mild or moderate depression |
| F31.4 | Bipolar affective disorder, current episode severe depression without psychotic symptoms |
| F31.5 | Bipolar affective disorder, current episode severe depression with psychotic symptoms |
| F31.6 | Bipolar affective disorder, current episode mixed |
| F31.7 | Bipolar affective disorder, currently in remission |
| F31.8 | Other bipolar affective disorders |
| F31.9 | Bipolar affective disorder, unspecified |