F31.31
BillableBipolar disorder, current episode depressed, mild
HCC Category Mapping
V28HCC 154 — Bipolar Disorders
0.265V24HCC 59 — Major Depressive, Bipolar, and Paranoid Disorders
0.309ESRDHCC 59 — Major Depressive, Bipolar, and Paranoid Disorders
0.000RxHCCHCC 131 — Bipolar Disorders
0.000What This Code Means
Bipolar disorder with a current mild depressive episode, where the person experiences depressed mood and loss of interest with minimal impact on daily functioning.
Coding Tips
- •Mild severity indicates the depressive symptoms cause minimal impairment in social, occupational, or other important areas
- •Document specific depressive symptoms and the level of functional impairment to support the mild severity designation
Clinical Significance
Bipolar disorder with current mild depressive episode indicates the patient is experiencing low-grade depressive symptoms within the context of their bipolar illness. While mild, this state requires monitoring for worsening and careful medication management to prevent both deepening depression and medication-induced mania. Capturing this accurately supports continuity of psychiatric care.
Documentation Requirements
- ✓Documented bipolar disorder diagnosis with history of manic or hypomanic episodes
- ✓Current depressive symptoms explicitly described as mild
- ✓Functional assessment showing minimal but present impairment
- ✓Absence of psychotic features
- ✓Current medication management plan
Commonly Confused Codes
F31.30 — Bipolar disorder, depressed, mild or moderate unspecified: Use F31.31 when mild is specifically documentedF31.32 — Bipolar disorder, depressed, moderate: Greater functional impairment than mildF32.0 — Major depressive disorder, single episode, mild: No bipolar historyF34.1 — Dysthymic disorder: Chronic low-grade depression without bipolar cycling
Code Hierarchy
└F31Bipolar disorder└F31.3Bipolar disorder, current episode depressed, mild or moderate severity└F31.31Bipolar disorder, current episode depressed, mild
└F31.31Bipolar disorder, current episode depressed, mild