---
title: "ICD-10-CM F31.9: Bipolar disorder, unspecified | BillingBrief"
description: "F31.9 is bipolar disorder with no further detail in the record, and it also covers the term manic depression. If the current episode type, severity or…"
canonical: "https://billingbrief.com/icd10/f31.9/"
language: "en"
---

# F31.9 Bipolar disorder, unspecified

ICD-10-CM · [CMS code reference](#source)

F31.9 is bipolar disorder with no further detail in the record, and it also covers the term manic depression. If the current episode type, severity or remission status is documented, use the matching code from F31.0 to F31.78; for bipolar II, use F31.81.

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Also covers

-   Manic depression

### Includes

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

### Excludes1

Not coded together with this code. The exception is when the two conditions are unrelated to each other.

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

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   cyclothymia ([F34.0](https://billingbrief.com/icd10/f34.0/))

## Related codes

-   [`F31.73` Bipolar disorder, in partial remission, most recent episode manic ICD-10-CM](https://billingbrief.com/icd10/f31.73/)
-   [`F31.74` Bipolar disorder, in full remission, most recent episode manic ICD-10-CM](https://billingbrief.com/icd10/f31.74/)
-   [`F31.75` Bipolar disorder, in partial remission, most recent episode depressed ICD-10-CM](https://billingbrief.com/icd10/f31.75/)
-   [`F31.76` Bipolar disorder, in full remission, most recent episode depressed ICD-10-CM](https://billingbrief.com/icd10/f31.76/)
-   [`F31.77` Bipolar disorder, in partial remission, most recent episode mixed ICD-10-CM](https://billingbrief.com/icd10/f31.77/)
-   [`F31.78` Bipolar disorder, in full remission, most recent episode mixed ICD-10-CM](https://billingbrief.com/icd10/f31.78/)
-   [`F31.81` Bipolar II disorder ICD-10-CM](https://billingbrief.com/icd10/f31.81/)
-   [`F31.89` Other bipolar disorder ICD-10-CM](https://billingbrief.com/icd10/f31.89/)

## Common questions

### Is F31.9 a billable code?

Yes. F31.9 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

F31 Bipolar disorder

Chapter

Mental, behavioral and neurodevelopmental disorders

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).