F31.3 – Bipolar disorder, current episode depressed, mild or moderate severity

ICD-10-CM 2027 diagnosis code · Mood [affective] disorders

Non-billable header

ICD-10-CM code F31.3

Code: F31.3 (claims format: F313)
Description: Bipolar disorder, current episode depressed, mild or moderate severity
Short description: Bipolar disord, current episode depress, mild or mod severt
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 5. Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
Block: F30-F39 Mood [affective] disorders
Parent codes: F31

Billable codes under F31.3

F31.3 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

F31 – Bipolar disorder

Includes:

bipolar I disorder
bipolar type I disorder
manic-depressive illness
manic-depressive psychosis
manic-depressive reaction
seasonal bipolar disorder

Excludes1 (not coded here):

bipolar disorder, single manic episode (F30.-)
major depressive disorder, single episode (F32.-)
major depressive disorder, recurrent (F33.-)

Excludes2 (not included here):

cyclothymia (F34.0)

Related codes in F31

Frequently asked questions

What is ICD-10 code F31.3?

F31.3 is the ICD-10-CM code for bipolar disorder, current episode depressed, mild or moderate severity, in the block F30-F39 (Mood [affective] disorders).

Is F31.3 a billable code?

No. F31.3 is a header code with more specific child codes; report one of the billable codes listed above.

What category does F31.3 belong to?

It belongs to category F31 – Bipolar disorder.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.