ICD-10-CM
ICD-10 code for Depression (acute) (mental) monopolar: F33.9
The ICD-10-CM index points "Depression (acute) (mental) monopolar" to F33.9, Major depressive disorder, recurrent, unspecified. F33.9 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in F33
A header groups codes and is not billed. A billable code is one you can report.
- F33Major depressive disorder, recurrentHeader
- F33.0Major depressive disorder, recurrent, mildBillable
- F33.1Major depressive disorder, recurrent, moderateBillable
- F33.2Major depressive disorder, recurrent severe without psychotic featuresBillable
- F33.3Major depressive disorder, recurrent, severe with psychotic symptomsBillable
- F33.4Major depressive disorder, recurrent, in remissionHeader
- F33.40Major depressive disorder, recurrent, in remission, unspecifiedBillable
- F33.41Major depressive disorder, recurrent, in partial remissionBillable
- F33.42Major depressive disorder, recurrent, in full remissionBillable
- F33.8Other recurrent depressive disordersBillable
- F33.9Major depressive disorder, recurrent, unspecifiedBillable
Excludes1
Excludes1 means these codes are not reported together.
From F33. A note on a category applies to every code under it.
Related conditions
Related pages
- F33.9 code detailsNotes, nearby codes, CMS-HCC group
- Category F33Every code under it
- Chapter 5Mental, behavioral and neurodevelopmental disorders
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Depression (acute) (mental) monopolar?
The ICD-10-CM index points "Depression (acute) (mental) monopolar" to F33.9, Major depressive disorder, recurrent, unspecified. F33.9 is a billable code.
Is F33.9 billable?
Yes. F33.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to F33.9?
The CDC tabular list gives 2 Excludes1 notes (not coded together) for F33.9 and the categories above it. They are listed on this page.
What chapter is F33.9 in?
Chapter 5. Mental, behavioral and neurodevelopmental disorders.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.