F31.9
ICD-10-CMThis code represents bipolar disorder where the specific type (e.g., I, II, cyclothymic) or current episode (e.g., manic, depressive, mixed, rapid cycling) is not documented or cannot be determined. It indicates the presence of a mood disorder characterized by significant fluctuations between manic/hypomanic and depressive states, but without further diagnostic specificity.
Use this code when the medical record clearly states a diagnosis of "bipolar disorder" but lacks sufficient detail to classify it as Bipolar I, Bipolar II, Cyclothymic Disorder, or other specified types. This is appropriate when the clinician has not yet fully characterized the patient's presentation or when documentation is incomplete regarding episode type or severity.
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