F31.9 – Bipolar disorder, unspecified
ICD-10-CM 2027 diagnosis code · Mood [affective] disorders
ICD-10-CM code
F31.9
- Code
F31.9(claims format:F319)- Description
- Bipolar disorder, unspecified
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
Notes for F31.9
Applicable to:
- Manic depression
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):
Excludes2 (not included here):
- cyclothymia (F34.0)
Index terms for F31.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in F31
- F31.0 – Bipolar disorder, current episode hypomanicBillable
- F31.1 – Bipolar disorder, current episode manic without psychotic featuresHeader
- F31.2 – Bipolar disorder, current episode manic severe with psychotic featuresBillable
- F31.3 – Bipolar disorder, current episode depressed, mild or moderate severityHeader
- F31.4 – Bipolar disorder, current episode depressed, severe, without psychotic featuresBillable
- F31.5 – Bipolar disorder, current episode depressed, severe, with psychotic featuresBillable
- F31.6 – Bipolar disorder, current episode mixedHeader
- F31.7 – Bipolar disorder, currently in remissionHeader
- F31.8 – Other bipolar disordersHeader
Frequently asked questions
What is ICD-10 code F31.9?
F31.9 is the ICD-10-CM code for bipolar disorder, unspecified, in the block F30-F39 (Mood [affective] disorders).
Is F31.9 a billable code?
Yes. F31.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does F31.9 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.