ICD-10 Codes for Bipolar Disorder: F31
Codes verified against the CMS FY2027 ICD-10-CM code descriptions (effective October 1, 2026; these codes are unchanged from FY2026). Reviewed . See sources.
What is the ICD-10 code for bipolar disorder?
Bipolar disorder is coded in category F31, where the code describes the current episode (hypomanic, manic, depressed, or mixed), its severity and psychotic features, or remission. F31.81 is bipolar II disorder and F31.9 is bipolar disorder, unspecified (manic depression). F31 and several subcategories are headings, so a billable code needs every character.
The FY2027 tabular list says F31 includes bipolar I disorder, manic-depressive illness, and seasonal bipolar disorder. Bipolar II has its own code, F31.81. Category F31 carries Excludes1 notes for a single manic episode (F30.-) and for major depressive disorder, single episode (F32.-) and recurrent (F33.-), so a depressive episode in a client with bipolar disorder is coded here, not in F32 or F33.
Below are the F31 codes with official FY2027 descriptions and billable status, grouped by episode type.
F31 bipolar disorder codes by current episode
| Code | Official description (FY2027) | Billable | When it fits |
|---|---|---|---|
| F31.0 | Bipolar disorder, current episode hypomanic | Yes | Current hypomanic episode. |
| F31.10 | Bipolar disorder, current episode manic without psychotic features, unspecified | Yes | Manic, severity not stated. |
| F31.11 | Bipolar disorder, current episode manic without psychotic features, mild | Yes | Manic, mild. |
| F31.12 | Bipolar disorder, current episode manic without psychotic features, moderate | Yes | Manic, moderate. |
| F31.13 | Bipolar disorder, current episode manic without psychotic features, severe | Yes | Manic, severe, no psychotic features. |
| F31.2 | Bipolar disorder, current episode manic severe with psychotic features | Yes | Manic, severe, with psychotic features. |
| F31.30 | Bipolar disorder, current episode depressed, mild or moderate severity, unspecified | Yes | Depressed, mild or moderate not specified. |
| F31.31 | Bipolar disorder, current episode depressed, mild | Yes | Depressed, mild. |
| F31.32 | Bipolar disorder, current episode depressed, moderate | Yes | Depressed, moderate. |
| F31.4 | Bipolar disorder, current episode depressed, severe, without psychotic features | Yes | Depressed, severe, no psychotic features. |
| F31.5 | Bipolar disorder, current episode depressed, severe, with psychotic features | Yes | Depressed, severe, with psychotic features. |
| F31.60 | Bipolar disorder, current episode mixed, unspecified | Yes | Mixed, severity not stated. |
| F31.63 | Bipolar disorder, current episode mixed, severe, without psychotic features | Yes | Mixed, severe. F31.61 (mild), F31.62 (moderate) and F31.64 (with psychotic features) complete the group. |
| F31.81 | Bipolar II disorder | Yes | Inclusion term: bipolar disorder, type 2. |
| F31.89 | Other bipolar disorder | Yes | Inclusion term: recurrent manic episodes NOS. |
| F31.9 | Bipolar disorder, unspecified | Yes | Inclusion term: manic depression. |
Bipolar disorder in remission: F31.7 codes
| Code | Official description (FY2027) | Billable | When it fits |
|---|---|---|---|
| F31.7 | Bipolar disorder, currently in remission | No (header) | Heading. Needs a fifth character. |
| F31.70 | Bipolar disorder, currently in remission, most recent episode unspecified | Yes | Remission, episode type not stated. |
| F31.71 | Bipolar disorder, in partial remission, most recent episode hypomanic | Yes | Partial remission after hypomania. |
| F31.72 | Bipolar disorder, in full remission, most recent episode hypomanic | Yes | Full remission after hypomania. |
| F31.73 | Bipolar disorder, in partial remission, most recent episode manic | Yes | Partial remission after mania. |
| F31.74 | Bipolar disorder, in full remission, most recent episode manic | Yes | Full remission after mania. |
| F31.75 | Bipolar disorder, in partial remission, most recent episode depressed | Yes | Partial remission after depression. |
| F31.76 | Bipolar disorder, in full remission, most recent episode depressed | Yes | Full remission after depression. |
| F31.77 | Bipolar disorder, in partial remission, most recent episode mixed | Yes | Partial remission after a mixed episode. |
| F31.78 | Bipolar disorder, in full remission, most recent episode mixed | Yes | Full remission after a mixed episode. |
Which headings in F31 are not billable?
In the FY2027 file, F31, F31.1, F31.3, F31.6, F31.7 and F31.8 are headings. Each needs another character on a claim. F31.0, F31.2, F31.4, F31.5 and F31.9 are complete, billable four-character codes. This mix is a common source of rejected claims.
Bipolar I, bipolar II and cyclothymia
Bipolar I disorder is included in category F31 and coded by the current episode. Bipolar II disorder is a single code, F31.81. Cyclothymic disorder is coded F34.0, which category F31 lists in an Excludes2 note. A single manic episode with no prior history is coded in F30 (for example F30.10, manic episode without psychotic symptoms, unspecified), which F31 excludes with an Excludes1 note.
The depression code guide covers F32 and F33 for unipolar depression.
How should bipolar disorder show up in each session note?
The F31 code changes with the clinical picture, so the note has to keep up. Each note should say what the current or most recent episode is, how severe it is, and whether psychotic features are present, or that the client is in partial or full remission. When the clinician documents a shift, such as from a depressed episode to remission, the code on the next claim changes too.
Example assessment line for a SOAP note: "Bipolar II disorder (F31.81). Mood stable over two weeks; sleep 7 to 8 hours; no hypomanic symptoms reported. Continues mood charting and relapse prevention plan." For bipolar I, the assessment would name the episode instead, for example "current episode depressed, moderate (F31.32)".
Coordinate with the prescriber when one is involved, and record what was shared. Notes from therapy and medication visits should describe the same diagnosis unless the record documents a change.
Which CPT codes are billed with bipolar diagnoses?
What should the session note show?
- The type of the current or most recent episode (hypomanic, manic, depressed, mixed), or remission status.
- Episode type, severity and whether psychotic features are present, so the full code (down to the fourth or fifth character) is supported.
- Mood symptoms reported and observed this session, and changes since the last visit.
- Risk assessment when indicated, and safety planning steps when taken.
- Interventions and response. A SOAP note separates observations from the assessment.
Common mistakes
- Reporting a heading such as F31.1, F31.3, F31.6 or F31.7 without its final character.
- Coding a depressive episode in a client with bipolar disorder as F32 or F33.
- Carrying the same current-episode code forward after the episode has changed.
- Using F31.9 when the record documents bipolar II (F31.81).
Frequently Asked Questions
What is the ICD-10 code for bipolar II?
F31.81, Bipolar II disorder. Its inclusion term is "Bipolar disorder, type 2". It is billable.
What is F31.9?
F31.9 is bipolar disorder, unspecified, with the inclusion term manic depression. It is billable, but a more specific code should be used when the current episode is documented.
What is the code for bipolar disorder, current episode depressed?
It depends on severity: F31.31 mild, F31.32 moderate, F31.30 mild or moderate unspecified, F31.4 severe without psychotic features, and F31.5 severe with psychotic features.
Is F31.7 billable?
No. F31.7 is a heading. Remission is coded F31.70 to F31.78 depending on partial or full remission and the most recent episode.
Is F31.81 billable?
Yes. F31.81, Bipolar II disorder, is a billable code in FY2027 ICD-10-CM.
What is the code for cyclothymia?
F34.0, Cyclothymic disorder. Category F31 lists cyclothymia in an Excludes2 note.
Related references
Sources
- CMS: FY2027 ICD-10-CM code descriptions in tabular order (zip)
- CMS: FY2027 ICD-10-CM code tables, tabular and index (zip)
- CMS and NCHS: ICD-10-CM Official Guidelines for Coding and Reporting, FY2027 (PDF)
- CMS: ICD-10 code files (FY2027 and FY2026 ICD-10-CM)
- CDC NCHS: ICD-10-CM and the ICD-10-CM Browser Tool
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