ICD-10-CM > F01-F99 > F30-F39 > F31 > F31.3 F31.3 Bipolar disorder, current episode depressed, mild or moderate severity Non-Billable/Non-Specific Codes F31.30Bipolar disorder, current episode depressed, mild or moderate severity, unspecifiedF31.31Bipolar disorder, current episode depressed, mildF31.32Bipolar disorder, current episode depressed, moderate