F31.9: Bipolar disorder, unspecified
Billable ICD-10-CM code, FY2027
What ICD-10-CM says
Includes
- Manic depression
Notes at F31, Bipolar disorder (they apply to every code under it)
Includes
- bipolar I disorder
- bipolar type I disorder
- manic-depressive illness
- manic-depressive psychosis
- manic-depressive reaction
- seasonal bipolar disorder
Excludes1 (never coded with F31.9)
- bipolar disorder, single manic episode (F30.-)
- major depressive disorder, single episode (F32.-)
- major depressive disorder, recurrent (F33.-)
Excludes2 (not part of F31.9; both may be coded)
- cyclothymia (F34.0)
What F31.9 covers
F31.9 is for bipolar disorder when the record does not describe the current episode. It includes manic depression. The F31 category includes bipolar I disorder and manic-depressive illness.
Psychiatry and behavioral health use it. Specific codes describe the current episode: hypomanic (F31.0), manic (F31.1, F31.2), depressed (F31.3-F31.5), mixed (F31.6-) and in remission (F31.7-). Bipolar II and other bipolar disorders are in F31.8-.
Billing and coding notes
F31 has an excludes1 for a single manic episode (F30.-) and for major depressive disorder, single episode (F32.-) or recurrent (F33.-). A depressive episode in a patient with bipolar disorder is coded within F31, not with an F32 or F33 code.
Cyclothymia (F34.0) is an excludes2. F31.9 is unspecified, so use an episode code once the clinician documents the current episode.
Related codes under F31
- F31.0 Bipolar disorder, current episode hypomanic
- F31.1 Bipolar disorder, current episode manic without psychotic features
- F31.2 Bipolar disorder, current episode manic severe with psychotic features
- F31.3 Bipolar disorder, current episode depressed, mild or moderate severity
- F31.4 Bipolar disorder, current episode depressed, severe, without psychotic features
- F31.5 Bipolar disorder, current episode depressed, severe, with psychotic features
- F31.6 Bipolar disorder, current episode mixed
- F31.7 Bipolar disorder, currently in remission
- F31.8 Other bipolar disorders
Questions about F31.9
Can F31.9 and F33.1 be coded together?
No. Major depressive disorder, recurrent (F33.-) is an excludes1 at F31. Depression in bipolar disorder is coded with an F31 depressed-episode code.
What is the code for bipolar II disorder?
Bipolar II is in F31.8-, other bipolar disorders, not F31.9. F31.9 is for bipolar disorder with no further detail.
ICD-10-CM in CloudMedico
In CloudMedico, a visit's diagnoses come from the current ICD-10-CM list. For US practices, the visit flags a code that isn't billable on its date, and a superbill made from an invoice carries the visit's diagnoses.
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